Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Eliminations Consolidation, Eliminations [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Eastern Eastern Region [Member] Eastern region. Western Western Region [Member] Western region. Recycling Recycling [Member] Recycling [Member] Other Other Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenues Revenues Depreciation and amortization Depreciation, Depletion and Amortization Operating (loss) income Operating Income (Loss) Interest expense, net Interest Income (Expense), Nonoperating, Net Capital expenditures Payments to Acquire Productive Assets Goodwill Goodwill Total assets Assets Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Class A Common Stock Common Class A [Member] Class B Common Stock Common Class B [Member] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivables - trade, net of allowance for doubtful accounts of $809 and $1,069, respectively Accounts Receivable, Net, Current Refundable income taxes Income Taxes Receivable, Current Prepaid expenses Prepaid Expense, Current Inventory Inventory, Gross Other current assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net of accumulated depreciation and amortization of $811,474 and $837,122, respectively Property, Plant and Equipment, Net Intangible assets, net Finite-Lived Intangible Assets, Net Restricted assets Restricted Cash and Investments, Noncurrent Cost method investments Cost Method Investments Deferred income taxes Deferred Income Tax Assets, Net Other non-current assets Other Assets, Noncurrent Total assets LIABILITIES AND STOCKHOLDERS' DEFICIT Liabilities and Equity [Abstract] CURRENT LIABILITIES: Liabilities, Current [Abstract] Current maturities of long-term debt and capital leases Long-term Debt and Capital Lease Obligations, Current Accounts payable Accounts Payable, Current Accrued payroll and related expenses Employee-related Liabilities, Current Accrued interest Interest Payable, Current Current accrued capping, closure and post-closure costs Accrued Capping, Closure, Post-closure and Environmental Costs Other accrued liabilities Other Accrued Liabilities, Current Total current liabilities Liabilities, Current Long-term debt and capital leases, less current portion Long-term Debt and Capital Lease Obligations Accrued capping, closure and post-closure costs, less current portion Accrued Capping, Closure, Post-closure and Environmental Costs, Noncurrent Deferred income taxes Deferred Income Tax Liabilities, Net Other long-term liabilities Other Liabilities, Noncurrent COMMITMENTS AND CONTINGENCIES Commitments and Contingencies STOCKHOLDERS' DEFICIT: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Casella Waste Systems, Inc. stockholders' deficit: Stockholders' Equity Attributable to Parent [Abstract] Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital, Common Stock Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss), net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Total Casella Waste Systems, Inc. stockholders' deficit Stockholders' Equity Attributable to Parent Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Total stockholders' deficit Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and stockholders' deficit Liabilities and Equity Earnings Per Share [Abstract] EARNINGS PER SHARE Earnings Per Share [Text Block] Business Combinations [Abstract] Schedule of Purchase Price Paid for Acquisitions Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of Unaudited Pro forma Combined Information Business Acquisition, Pro Forma Information [Table Text Block] Asset Retirement Obligation Disclosure [Abstract] Changes to Accrued Capping, Closure and Post-Closure Liabilities Schedule of Change in Asset Retirement Obligation [Table Text Block] Quarterly Financial Information Disclosure [Abstract] QUARTERLY FINANCIAL INFORMATION (UNAUDITED) Quarterly Financial Information [Text Block] Debt Disclosure [Abstract] Loss on debt extinguishment Gain (Loss) on Extinguishment of Debt LONG TERM DEBT AND CAPITAL LEASES Debt and Capital Leases Disclosures [Text Block] Commitments and Contingencies Disclosure [Abstract] Site Contingency [Table] Site Contingency [Table] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Potsdam Environmental Remediation Liability Potsdam Environmental Liability [Member] Potsdam environmental liability. Site Contingency [Line Items] Site Contingency [Line Items] Accrual for Environmental Loss Contingencies [Roll Forward] Accrual for Environmental Loss Contingencies [Roll Forward] Beginning balance Accrual for Environmental Loss Contingencies Payments Accrual for Environmental Loss Contingencies, Payments Obligations incurred Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses Ending balance Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Transfer Stations Acquisition Transfer Stations Acquisition [Member] Transfer Stations Acquisition [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Purchase Price: Payments to Acquire Businesses, Net of Cash Acquired [Abstract] Cash used in acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Notes payable Business Combination, Consideration Transferred, Liabilities Incurred Other non-cash considerations Business Combination, Consideration Transferred, Other Contingent consideration and holdbacks Business Combination, Consideration Transferred, Holdback Amount of potential future consideration held back by the acquirer as part of consideration transferred in a business combination until certain conditions are met. Total Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Total Business Combination, Consideration Transferred Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Land Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land Buildings Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equipment Other liabilities, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Fair value of assets acquired and liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Excess purchase price to be allocated to goodwill Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Beginning balance Asset Retirement Obligation Obligations incurred Asset Retirement Obligation, Liabilities Incurred Revisions in estimates Asset Retirement Obligation, Revision of Estimate Accretion expense Asset Retirement Obligation, Accretion Expense Obligations settled Asset Retirement Obligation, Liabilities Settled Ending balance Line of Credit Facility [Table] Line of Credit Facility [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Secured Debt Secured Debt [Member] Line of Credit Line of Credit [Member] Senior Subordinated Notes, Due February 2019; bore interest at 7.75% Senior Subordinated Notes Due Two Thousand Nineteen [Member] Senior Subordinated Notes Due Two Thousand Nineteen [Member] Revolving Credit Facility Senior Secured Asset Based Revolving Credit Facility Due Two Thousand And Twenty [Member] Senior Secured Asset Based Revolving Credit Facility Due Two Thousand And Twenty [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Term Loan B Facility Term Facility due October 2023 (Term Loan B Facility) [Member] Term Facility due October 2023 (Term Loan B Facility) [Member] Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% Revolving Credit Facility due October 2021 [Member] Revolving Credit Facility due October 2021 [Member] Term Loan Facility B, Repricing Amendment Term Loan Facility B, Repricing Amendment [Member] Term Loan Facility B, Repricing Amendment [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Letter of Credit Letter of Credit [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] LIBOR Floor London Interbank Offered Rate (LIBOR) Floor [Member] London Interbank Offered Rate (LIBOR) Floor [Member] Base Rate Base Rate [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Debt Covenant Terms [Axis] Debt Covenant Terms [Axis] Debt Covenant Terms [Axis] Debt Covenant Terms [Domain] Debt Covenant Terms [Domain] [Domain] for Debt Covenant Terms [Axis] Debt Instrument, Covenant Compliance, Consolidated Net Leverage Ratio Debt Instrument, Covenant Compliance, Consolidated Net Leverage Ratio [Member] Debt Instrument, Covenant Compliance, Consolidated Net Leverage Ratio [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Principal amount Debt Instrument, Face Amount Credit facility maximum Line of Credit Facility, Maximum Borrowing Capacity Debt instrument interest rate Debt Instrument, Interest Rate, Stated Percentage Debt redemption price Debt Instrument, Redemption Price, Percentage Additional revolver capacity Additional Revolver Capacity Amount of additional optional borrowing capacity under the credit facility. Facility term Debt Instrument, Term Basis spread on variable rate Derivative, Basis Spread on Variable Rate Net leverage ratio Debt Instrument, Covenant Compliance, Net Leverage Ratio Debt Instrument, Covenant Compliance, Net Leverage Ratio Decrease in basis points Debt Instrument, Increase (Decrease) in Basis Spread on Variable Rate Debt Instrument, Increase (Decrease) in Basis Spread on Variable Rate Interest rate Debt Instrument, Basis Spread on Variable Rate Remaining capacity Line of Credit Facility, Remaining Borrowing Capacity Outstanding irrevocable letters of credit totaling Letters of Credit Outstanding, Amount Schedule of Future Minimum Rental Payments under Non-Cancellable Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Environmental Liability Associated with Potsdam Schedule of Environmental Loss Contingencies by Site [Table Text Block] Schedule of Total Expected Environmental Remediation Payments for Succeeding Year Schedule Of Future Environmental Remediation Payments [Table Text Block] Tabular disclosure of future environmental remediation payments as of the latest balance sheet presented, in aggregate and for each of the five succeeding fiscal years and thereafter. Reconciliation of Expected Aggregate Non-inflated, Undiscounted Environmental Remediation Liability to Amount Recognized in Statement of Financial Position Schedule of Reconciliation of Expected Undiscounted Liability To Actual Liability [Table Text Block] Reconciliation of the environmental remediation liability to the undiscounted environmental remediation liability as of the latest balance sheet date. Income Tax Disclosure [Abstract] Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Tax at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Decrease in net federal deferred tax assets before valuation allowance change due to federal rate change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Decrease in valuation allowance by 80% of indefinite lived deferred liabilities due to US tax reform Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Indefinite Lived Deferred Tax Liability, Income Tax Benefit Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Indefinite Lived Deferred Tax Liability, Income Tax Benefit Other changes in valuation allowance, including due to federal rate change Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Including Federal Rate Change, Amount Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance Including Federal Rate Change, Amount Deductible stock awards Effective Income Tax Rate Reconciliation, Deductible Stock Awards Effective Income Tax Rate Reconciliation, Deductible Stock Awards Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Non-deductible expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Non-deductible equity income in subsidiaries Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Other, net Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount (Benefit) provision for income taxes Income Tax Expense (Benefit) Fair Value Disclosures [Abstract] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Accounting Changes and Error Corrections [Abstract] Accounting Changes New Accounting Pronouncements, Policy [Policy Text Block] Management's Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Accounts Receivable - Trade, Net of Allowance for Doubtful Accounts Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Inventory Inventory, Policy [Policy Text Block] Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Landfill Accounting and Final Capping, Closure and Post-Closure Costs Asset Retirement Obligation [Policy Text Block] Leases Lessee, Leases [Policy Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Investments in Unconsolidated Entities Investment, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Environmental Remediation Liabilities Environmental Costs, Policy [Policy Text Block] Self-Insurance Liabilities and Related Costs Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Derivatives and Hedging Derivatives, Policy [Policy Text Block] Contingent Liabilities and Legal Proceedings Commitments and Contingencies, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Asset Impairments Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Defined Benefit Pension Plan Pension and Other Postretirement Plans, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Subsequent Events Subsequent Events, Policy [Policy Text Block] Restricted Assets Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Receivables [Abstract] RESTRICTED ASSETS Restricted Assets Disclosure [Text Block] Related Party Transactions [Abstract] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Retirement Benefits [Abstract] Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table] Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table] Employee Stock Purchase Plan [Line Items] Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] Maximum matching contribution per dollar per employee contribution Defined Contribution Plan, Maximum Employer Match Per Employee, Per Dollar Contribution Defined Contribution Plan, Maximum Employer Match Per Employee, Per Dollar Contribution Maximum match per employee per calendar year Defined Contribution Plan, Employer Maximum Contribution Per Employee Per Year, Amount Defined Contribution Plan, Employer Maximum Contribution Per Employee Per Year, Amount Employer contributions vesting period Deferred Compensation Arrangement with Individual, Requisite Service Period Employer contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Discount rate Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Stock issued under stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Stock available for distribution under stock purchase plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, beginning balance Acquisitions Goodwill, Acquired During Period Goodwill, ending balance Accounting Policies [Abstract] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Recycle Rewards Inc Recycle Rewards Inc [Member] Recycle Rewards Inc [Member] GreenerU Inc GreenerU Inc [Member] GreenerU Inc [Member] Agreen Energy LLC Agreen Energy LLC [Member] Agreen Energy LLC [Member] Bgreen Energy LLC Bgreen Energy LLC [Member] Bgreen Energy LLC [Member] Agreen And Bgreen Agreen And Bgreen [Member] Agreen And Bgreen [Member] Reporting units exceeded their carrying values Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount Goodwill impairment incurred Goodwill, Impairment Loss Outstanding common stock percentage Cost Method Investment Ownership Percentage Cost method investment ownership percentage. Investment impairment charge Other than Temporary Impairment Losses, Investments Carrying amount of cost method investment Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Noncontrolling Interests Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Beginning balance (in shares) Common Stock, Shares, Outstanding Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax Issuances of Class A common stock Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Issuances of Class A common stock (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Distributions to noncontrolling interest holder Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Other Noncontrolling Interest, Increase from Subsidiary Equity Issuance Other Stockholders' Equity, Other Ending balance Ending balance (in shares) Increase in tax provision due to Tax Act Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Income Tax Expense (Benefit) Deferred tax benefit related to continuing operations Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Change In Valuation Allowance, Income Tax Benefit For Continuing Operations Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Change In Valuation Allowance, Income Tax Benefit For Continuing Operations Deferred tax benefit of indefinite lived deferred tax liabilities Income tax settlement amount Income Tax Settlement Income tax settlement. Tax paid for income tax settlement Income Tax Settlement Tax Paid Income tax settlement tax paid. Interest paid for income tax settlement Income Tax Settlement Interest Paid Income tax settlement interest paid. Potential cumulative liability (less than) Percentage Of Potential Cumulative Liability Percentage of potential cumulative liability. Deferred federal taxes asset Long-term deferred state tax liability Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Domestic State net operating loss carryforwards expiry period Deferred Tax Assets, Operating Loss Carryforwards, State and Local Alternative minimum tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax General business tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, General Business Increase (decrease) in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Deferred tax expense (benefit) due to Tax Cuts and Jobs Act Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, Change in Tax Rate, Deferred Tax Income Tax Expense (Benefit) Unrecognized tax benefit net of federal benefit on state issue Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized tax benefits Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Uncertain tax positions, accrued interest Unrecognized Tax Benefits, Interest on Income Taxes Accrued Uncertain tax positions, penalties Unrecognized Tax Benefits, Income Tax Penalties Accrued Accrued income tax expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Equity [Abstract] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Marketable Securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Interest rate swaps Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Amounts reclassified from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Other comprehensive income (loss), net of taxes Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest Rate Contracts Interest Rate Contract [Member] Interest Rate Contracts - February 2021 Interest Rate Contract - February 2021 [Member] Interest Rate Contract - February 2021 [Member] Interest Rate Contracts - February 2022 Interest Rate Contract - February 2022 [Member] Interest Rate Contract - February 2022 [Member] Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Number of interest rate swaps (agreement) Derivative, Number of Instruments Held Settlement of forward starting interest rate derivative agreements Derivative Settlement Of Forward Starting Interest Rate Swap Agreement Cash settlement of interest rate swap. Total notional amount Derivative, Notional Amount Floor rate received Derivative, Floor Interest Rate Weighted average rate paid Derivative, Average Fixed Interest Rate Derivative asset in other non-current assets Derivative Asset, Noncurrent Derivative liability in other accrued liabilities Derivative Liability, Current Unusual or Infrequent Items, or Both [Abstract] Southbridge Landfill Southbridge Landfill [Member] Southbridge landfill. Asset impairment charge Impairment of Long-Lived Assets to be Disposed of Project development charge Noncash Project Abandonment Costs Environmental remediation charge Environmental Remediation Expense Legal and transaction costs Legal Fees Landfill Closure Charge Landfill Closure Charge The aggregate charge associated with the closure of a landfill, which is comprised of an asset impairment charge, a project development charge, an environmental remediation charge, and related legal and transaction costs. Legal costs for the acquisition Divestiture Acquisition Financing Costs The aggregate amount of significant divestiture and acquisition expenses, along with certain financing costs, recognized during an accounting period that are not disclosed separately. Generally, these items are either unusual or infrequent, but not both. Contract settlement charge Contract Settlement Charge Amount of loss recognized in the period associated with the settlement of a future obligation associated with the termination of a contract. Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Schedule of Multiemployer Plans [Table] Schedule of Multiemployer Plans [Table] Multiemployer Plan Type [Axis] Multiemployer Plan Type [Axis] Multiemployer Plans Type [Domain] Multiemployer Plans Type [Domain] Multiemployer Pension Plans Multiemployer Plans, Pension [Member] Multiemployer Plan Name [Axis] Multiemployer Plan Name [Axis] Multiemployer Plan Name [Domain] Multiemployer Plan Name [Domain] New England Teamsters and Trucking Industry Pension Fund New England Teamsters and Trucking Industry Pension Fund [Member] New England Teamsters and Trucking Industry Pension Fund [Member] Multiemployer Plans [Line Items] Multiemployer Plans [Line Items] Contributions to Plan Multiemployer Plan, Contributions by Employer INCOME TAXES Income Tax Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Building and Improvements Building and Building Improvements [Member] Machinery and Equipment Machinery and Equipment [Member] Rolling Stock Rolling Stock [Member] Rolling Stock [Member] Containers Containers [Member] Furniture and Fixtures Furniture and Fixtures [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property plant and equipment, estimated useful life Property, Plant and Equipment, Useful Life Other Commitments [Table] Other Commitments [Table] 21E Settlement and Water System Construction Funding Agreement 21E Settlement and Water System Construction Funding Agreement [Member] 21E Settlement and Water System Construction Funding Agreement [Member] Bonds Bonds [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] MADEP Massachusetts Department of Environmental Protection (MADEP) and Casella Waste Systems [Member] Massachusetts Department of Environmental Protection (MADEP) and Casella Waste Systems [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case [Domain] Litigation Case [Domain] Notice of Intent to Sue under the Resource Conservation and Recovery Act Notice of Intent to Sue under the Resource Conservation and Recovery Act [Member] Notice of Intent to Sue under the Resource Conservation and Recovery Act [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Employment Contracts Employment Contracts [Member] Other Commitments [Line Items] Other Commitments [Line Items] Monthly payments (up to) Payments for Rent Total rent expense under operating leases charged to operations Operating Leases, Rent Expense, Net Agreement in principle amount (up to) Loss Contingency, Estimate of Possible Loss Anticipated costs Environmental Exit Costs, Anticipated Cost Risk free interest rate Accrual for Environmental Loss Contingencies, Discount Rate Future cash payments Loss on Contract Termination Number of acres composing solid waste transfer station (in acres) Scrap Yard And Solid Waste Transfer Station Acreage of scrap yard owned by WSI. Estimate of total undiscounted costs associated with implementing the preferred remedies Undiscounted Costs Preferred Remedies Estimated undiscounted remediation costs. Remediation activities, participant share percentage Percentage Participation in Onsite Remediation Activities Percentage participation in onsite remediation activities. Number of executive officers Employment Contracts Executive Officers The number of executive officers that we have employment contracts with. Initial term of employment contract Initial Term Of Executive Employment Agreement Initial term of employment agreements. Intangible assets, useful life Finite-Lived Intangible Asset, Useful Life Contract extension period Contract Extension Period Contract extension period. Total annual commitments for salaries Commitment Amount Under Employment Agreement Annual salary commitments under employment agreements. Salary and bonuses payment range Contractual Obligation Payments Period Years of salary and bonus due to employee upon change in control or involuntary termination without cause. Components of Long-Term Debt and Capital Leases Schedule of Debt [Table Text Block] Components of Interest Expense Interest Income and Interest Expense Disclosure [Table Text Block] Schedule of Future Maturities of Debt Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] New York Bonds, 2016 New York Bonds Two Thousand Sixteen [Member] New York Bonds 2016. New York Bonds, 2014 New York Bonds [Member] New York Bonds [Member] New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125% Revenue Bond Series Two Thousand Fourteen R Two Due Two Thousand Forty Four [Member] Revenue Bond Series Two Thousand Fourteen R Two Due Two Thousand Forty Four [Member] Unsecured Debt Unsecured Debt [Member] Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2018; bearing interest at 4.75% Revenue Bonds Series Two Thousand Fifteen Due Two Thousand Thirty Five [Member] Revenue Bonds Series Two Thousand Fifteen Due Two Thousand Thirty Five [Member] Fixed Rate Bonds Fixed Rate Bonds [Member] Fixed rate bonds. New Hampshire Bonds New Hampshire Bonds [Member] New Hampshire Bonds [Member] Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1; letter of credit backed due January 2025 - bore interest at SIFMA Index Revenue Bonds Series Two Thousand Five Rone Due Two Thousand Twenty Five [Member] Revenue Bonds Series Two Thousand Five Rone Due Two Thousand Twenty Five [Member] Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25% Revenue Bonds Series Two Thousand Five Rtwo Due Two Thousand Twenty Five [Member] Revenue Bonds Series Two Thousand Five Rtwo Due Two Thousand Twenty Five [Member] Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25% Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 (FAME Bonds 2005R-3) [Member] Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 (FAME Bonds 2005R-3) [Member] Vermont Bonds Vermont Bonds [Member] Vermont Bonds. Debt Instrument [Line Items] Debt Instrument [Line Items] Aggregate principal amount Long-term Debt, Gross Aggregate principal amount Debt and Capital Lease Obligations Additional bond issued Debt Instrument Additional Borrowings Feature Additional draw down available under the indenture. FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS Asset Retirement Obligation Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Deferred tax assets: Deferred Tax Assets, Tax Deferred Expense [Abstract] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Accrued expenses and reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Book over tax depreciation of property and equipment Deferred Tax Assets, Property, Plant and Equipment Stock awards Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Gross Less: valuation allowance Deferred Tax Assets, Valuation Allowance Total deferred tax assets after valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Amortization of intangibles Deferred Tax Liabilities, Intangible Assets Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax asset Deferred Tax Assets, Net Net deferred tax liability Deferred Tax Liabilities, Net Schedule of Limited Partners' Capital Account by Class [Table] Schedule of Limited Partners' Capital Account by Class [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2016 Incentive Plan 2016 Incentive Plan [Member] 2016 Incentive Plan Weighted Average Weighted Average [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Non-Employee Director Non Employee Director [Member] Non Employee Director [Member] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Awards Restricted Stock Awards [Member] Restricted Stock Awards [Member] Stock Options Employee Stock Option [Member] Market-based Performance Stock Options Market-based Performance Stock Options [Member] Market-based Performance Stock Options [Member] Restricted Stock, Restricted Stock Units and Performance Stock Units Restricted Stock Restricted Stock Units And Performance Stock Units [Member] Restricted stock, restricted stock units and performance stock units. Restricted Stock and Restricted Stock Unit Restricted Stock And Restricted Stock Unit [Member] Restricted stock and restricted stock unit. Performance Stock Units Performance Stock Unit [Member] Performance stock unit. Restricted Stock, Restricted Stock Units and Performance Stock Units Stock Options, Performance Stock Units, Restricted Stock Units And Restricted Stock [Member] Stock options, performance stock units, restricted stock units and restricted stock. Market-based Performance Stock Units Market-based Performance Stock Units [Member] Market-based Performance Stock Units [Member] Amended and Restated 1997 Employee Stock Purchase Plan Amended And Restated Nineteen Ninety Seven Employee Stock Purchase Plan [Member] Amended And Restated Nineteen Ninety Seven Employee Stock Purchase Plan [Member] Limited Partners' Capital Account [Line Items] Limited Partners' Capital Account [Line Items] Vote for each share held (in votes per share) Stockholders' Equity, Votes per Share Held Stockholders' Equity, Votes per Share Held Preferred stock authorized to issue (up to) (in shares) Preferred Stock, Shares Authorized Shares issued (in shares) Preferred Stock, Shares Issued Common stock, authorized shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Number of shares available for future grant (in shares) Options granted period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Options vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock-based compensation expense Allocated Share-based Compensation Expense Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options Employee Service Share Based Compensation Tax Provision From Exercise Of Stock Options Employee Service Share Based Compensation Tax Provision From Exercise Of Stock Options Aggregate intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Total unrecognized stock-based compensation expense related to all outstanding stock options (in shares) Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Unrecognized stock-based compensation expense, weighted average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Options granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Monte Carlo Option-Pricing Model, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Monte Carlo Option-Pricing Model, Weighted Average Exercise Price Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted average fair value of market-based performance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Incremental compensation expense Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost Total fair value of other stock awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Unrecognized stock-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Income taxes associated with stock-based compensation expense Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options Tax benefits from additional paid-in-capital adjustments Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Collection Business Collection Business [Member] Collection Business [Member] Solid Waste Collection Business Solid Waste Collection Business [Member] Solid Waste Collection Business [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Total consideration from Complete Disposal acquisition Number of businesses acquired Number of Businesses Acquired SEGMENT REPORTING Segment Reporting Disclosure [Text Block] BUSINESS COMBINATIONS Business Combination Disclosure [Text Block] Accounting Changes New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefits at beginning of period Unrecognized Tax Benefits Gross increases for tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Gross decreases for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Reductions resulting from lapse of statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Unrecognized tax benefits at end of period Accounts receivable - trade, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Property, plant and equipment, accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, authorized shares (in shares) Common Stock, Shares Authorized Common stock, issued shares (in shares) Common Stock, Shares, Issued Common stock, outstanding shares (in shares) Common stock, votes (in votes per share) Operating income (loss) Net (loss) income Net (loss) income attributable to common stockholders Net Income (Loss) Attributable to Parent Earnings per common share: Earnings Per Share, Basic and Diluted [Abstract] Basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Basic earnings per share (in dollars per share) Earnings Per Share, Basic Diluted weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted earnings per share (in dollars per share) Earnings Per Share, Diluted Property, Plant and Equipment [Abstract] PROPERTY, PLANT AND EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Closure And Post Closure Costs Closure And Post Closure Costs [Member] Closure and Post-closure costs. Capitalized interest Interest Costs Capitalized Closure and post-closure costs incurrence period Closure and Post-Closure Costs Incurrence Period Closure and Post-Closure Costs Incurrence Period Estimate of inflation rate Inflation Rate Estimated inflation rate. Rate of asset retirement obligation Fair Value Inputs, Discount Rate Surety bond Surety Bonds Amount of surety bonds that are available for the future payment of landfill capping, closure and post-closure obligations. Letters of credit Number of operation and management agreements entered into Number of Landfill Operation and Management Agreements Entered Into Number of Landfill Operation and Management Agreements Entered Into STOCKHOLDERS' EQUITY Shareholders' Equity and Share-based Payments [Text Block] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due Schedule of Activity and Balances Related to Goodwill by Reporting Segment Schedule of Goodwill [Table Text Block] Components of Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Estimated Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] 2018 Long-term Debt and Capital Lease Obligations, Repayments of Principal in Next Twelve Months 2019 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal after Year Five Long-term debt and capital lease Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), net of taxes: Other Comprehensive Income (Loss), Net of Tax [Abstract] Interest rate swap settlements Other Comprehensive Income (Loss), Settlement on Derivatives, After Tax Other Comprehensive Income (Loss), Settlement on Derivatives, After Tax Interest rate swap amounts reclassified into interest expense Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Unrealized gain resulting from changes in fair value of derivative instruments Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Unrealized gain (loss) resulting from changes in fair value of marketable securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Net (loss) income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive loss attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Derivative instruments Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] Interest rate swaps Interest Rate Swap [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification Out of Accumulated Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Interest expense Interest Expense Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (Benefit) provision for income taxes Net loss GOODWILL AND INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Multiemployer Defined Benefit Pension Plans Schedule of Multiemployer Plans [Table Text Block] Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Collection Solid Waste Operations Collection [Member] Solid Waste Operations Collection [Member] Disposal Solid Waste Operations Disposal [Member] Solid Waste Operations Disposal [Member] Power generation Solid Waste Operations Power Generation [Member] Solid Waste Operations Power Generation [Member] Processing Solid Waste Operations Processing [Member] Solid Waste Operations Processing [Member] Solid waste operations Solid Waste Operations [Member] Solid waste operations. Organics Organics [Member] Organics. Customer solutions Customer Solutions [Member] Customer solutions. Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Revenues percentage Concentration Risk, Percentage Income Statement [Abstract] Operating expenses: Costs and Expenses [Abstract] Cost of operations Cost of Goods and Services Sold General and administration General and Administrative Expense Southbridge Landfill closure charge Expense from divestiture, acquisition and financing costs Environmental remediation charge Divestiture transactions Divestiture Transactions The aggregate amount of losses and (gains) associated with the disposal of an asset group or an individually significant group of assets that does not constitute a disposal group. This includes any gain or loss on disposal of the asset group, as well as any impairment charge related to the asset group that was subsequently disposed of. Total operating expenses Costs and Expenses Operating (loss) income Other expense (income): Nonoperating Income (Expense) [Abstract] Interest income Interest Income, Other Loss on derivative instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Impairment of investments Other income Other Nonoperating Income Other expense, net Nonoperating Income (Expense) Loss before income taxes (Benefit) provision for income taxes Net loss Less: Net (loss) income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net loss attributable to common stockholders Net loss attributable to common stockholders: Net Income (Loss) Attributable to Parent [Abstract] Net loss attributable to common stockholders Weighted average common shares outstanding: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Basic and diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Basic and diluted earnings per share: Net loss per common share (in dollars per share) Earnings Per Share, Basic and Diluted Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [Member] Restricted assets - landfill closure Landfill [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets: Restricted assets - landfill closure Interest rate swaps Derivative Asset Total asset fair value Assets, Fair Value Disclosure Liabilities: Liabilities [Abstract] Interest rate swaps Interest Rate Derivative Liabilities, at Fair Value Schedule of Provision (Benefit) for Income Taxes Continuing Operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Difference in Provision (Benefit) for Income Taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Reconciliation of Gross Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Undiscounted liability Accrual for Environmental Loss Contingencies, Gross Less discount, net Accrual for Environmental Loss Contingencies, Discount Liability Balance - December 31, 2017 Charges Associated with Closure of Southbridge Landfill Environmental Exit Costs by Cost [Table Text Block] Document And Entity Information [Abstract] Document and entity information. Document Information [Table] Document Information [Table] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Trading Symbol Trading Symbol Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Federal Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Federal Tax Expense (Benefit) Current benefit of loss carryforwards Current Federal Deferred Benefit Loss Carryforwards Current Federal Deferred Benefit Loss Carryforwards Deferred Deferred Federal Income Tax Expense (Benefit) Total Federal Income Tax Expense (Benefit), Continuing Operations State State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current State and Local Tax Expense (Benefit) Current benefit of loss carryforwards Current State Deferred Benefit Loss Carryforwards Current State Deferred Benefit Loss Carryforwards Deferred Deferred State and Local Income Tax Expense (Benefit) Total State and Local Income Tax Expense (Benefit), Continuing Operations OTHER ITEMS AND CHARGES Unusual or Infrequent Items, or Both, Disclosure [Text Block] Summary of Restricted Assets Restrictions on Cash and Cash Equivalents [Table Text Block] Schedule of Numerator and Denominator Used in Computation of Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding, beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding, ending balance (in shares) Exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Unvested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding, beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding, ending balance (in dollars per share) Exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Unvested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Weighted average remaining contractual term, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual term, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Weighted average remaining contractual term, unvested Share-based Compensation Arrangement by Share-based Payment Award, Options, Unvested, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Options, Unvested, Weighted Average Remaining Contractual Term Aggregate intrinsic value, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Aggregate intrinsic value, unvested Share-based Compensation Arrangement by Share-based Payment Award, Options, Unvested, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Unvested, Aggregate Intrinsic Value Attainment level percentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Additional issuance if performance targets met (in shares) Common Stock, Capital Shares Reserved for Future Issuance Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Valuation and Qualifying Accounts [Abstract] Schedule II - Valuation Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Schedule of Recent Accounting Pronouncements Not Yet Adopted Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Discontinued Operations and Disposal Groups [Abstract] DIVESTITURE TRANSACTIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Schedule of Capital Leased Assets [Table] Schedule of Capital Leased Assets [Table] Major Property Class [Axis] Major Property Class [Axis] Major Property Class [Domain] Major Property Class [Domain] Automobile Plan Automobiles [Member] Capital Leased Assets [Line Items] Capital Leased Assets [Line Items] Maximum exposure automobile plan per individual event Maximum Exposure Self Insured Maximum exposure per individual event. Self insurance reserves Self Insurance Reserve Estimated Useful Lives of Assets Property, Plant and Equipment [Table Text Block] Term Loan B Facility due October 2023; bearing interest at LIBOR plus 2.50% New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 due December 2044 - fixed rate interest period through 2019; bearing interest at 3.75% Revenue Bonds Series Two Thousand Fourteen Due Two Thousand Forty Four [Member] Revenue Bonds Series Two Thousand Fourteen Due Two Thousand Forty Four [Member] Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 due April 2029 - fixed rate interest period through 2019; bearing interest at 4.00% Long Term Revenue Bond Series Two Thousand Thirteen Due Two Thousand Thirty Six [Member] Long Term Revenue Bond Series Two Thousand Thirteen Due Two Thousand Thirty Six [Member] Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25% Revenue Bond Series Two Thousand Thirteen Due Two Thousand Twenty Nine [Member] Revenue Bond Series Two Thousand Thirteen Due Two Thousand Twenty Nine [Member] Capital leases maturing through September 2023; bearing interest at up to 7.70% Capital Lease Obligations [Member] Notes payable maturing through June 2027; bearing interest at up to 7.00% Notes Payable [Member] Notes Payable [Member] Long-term debt and capital lease Less—unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Long-term debt and capital leases less unamortized discount and debt issuance costs Long-term Debt and Capital Lease Obligations, Including Current Maturities Less—current maturities of long-term debt Long-term debt and capital leases, less current maturities Unamortized discount Debt Instrument, Unamortized Discount Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Fair value of debt Debt Instrument, Fair Value Disclosure Fair value of line of credit Lines of Credit, Fair Value Disclosure Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Restricted Stock, Restricted Stock Units, and Performance Stock Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding, beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding, ending balance (in shares) Unvested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Unvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Unvested, Number Weighted Average Grant Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding, beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding, ending balance (in dollars per share) Weighted average grant price, unvested, ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Unvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Unvested, Weighted Average Grant Date Fair Value Weighted average remaining contractual term, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Weighted average remaining contractual term, unvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Remaining Contractual Term Aggregate intrinsic value, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Aggregate intrinsic value, unvested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Intrinsic Value Additional issuance if performance targets met (in shares) Additional Shares Issued Maximum Attainment Level Additional shares of Class A Common Stock potentially issuable if maximum attainment levels are met. Summary of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Operating segments Number of Operating Segments Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] CCI Affiliated Entity [Member] Related Party Related Party [Member] Related Party [Member] Capital Lease Obligations Related Party Transaction [Line Items] Related Party Transaction [Line Items] Total services purchased Related Party Transaction, Purchases from Related Party Outstanding accounts payable Accounts Payable, Related Parties, Current Revenue from related party Revenue from Related Parties Number of leases Number Of Leases Number of related party capital lease agreements entered into. Lease extended period Leases monthly payments Debt Instrument, Periodic Payment Total expense charged to operations under lease agreement Capital Leases, Income Statement, Amortization Expense Landfill post-closure cost Asset Retirement Obligation, Cash Paid to Settle Accrued costs associated with post-closure obligations EMPLOYEE BENEFIT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] Accretion expense Obligations incurred Accrual For Environmental Loss Contingencies, Obligations Incurred Accrual For Environmental Loss Contingencies, Obligations Incurred Obligations settled 2018 Accrual for Environmental Loss Contingencies, Undiscounted, Next Twelve Months 2019 Accrual for Environmental Loss Contingencies, Undiscounted, Second Year 2020 Accrual for Environmental Loss Contingencies, Undiscounted, Third Year 2021 Accrual for Environmental Loss Contingencies, Undiscounted, Fourth Year 2022 Accrual for Environmental Loss Contingencies, Undiscounted, Fifth Year Thereafter Accrual for Environmental Loss Contingencies, Undiscounted, after Fifth Year Total Investments under equity method of accounting Equity Method Investments Land Land [Member] Landfills Landfills [Member] Landfills. Landfill operating lease contracts Landfill Operating Lease [Member] Landfill Operating Lease [Member] Property, plant and equipment, gross Property, Plant and Equipment, Gross Less: accumulated depreciation and amortization Property, plant and equipment, net Statement of Cash Flows [Abstract] Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depletion of landfill operating lease obligations Depletion Of Landfill Operating Lease Obligations This element represents the noncash expense charged against earnings to recognize the depletion of landfill operating lease obligations. Interest accretion on landfill and environmental remediation liabilities Accretion Expense, Including Asset Retirement Obligations Amortization of debt issuance costs and discounts on long-term debt Amortization of Debt Issuance Costs and Discounts Stock-based compensation Share-based Compensation Environmental remediation charge Environmental Remediation Expense, Including Non-cash Charges Environmental Remediation Expense, Including Non-cash Charges Loss (gain) on sale of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Southbridge Landfill non-cash closure charge Noncash Landfill Closure Charge The non-cash portion of the aggregate charge associated with the closure of a landfill, which includes a non-cash asset impairment charge, a non-cash project development charge, and a non-cash environmental remediation charge. Excess tax benefit on the vesting of share based awards Excess Tax Benefit from Share-based Compensation, Operating Activities Deferred income taxes Deferred Income Tax Expense (Benefit) Changes in assets and liabilities, net of effects of acquisitions and divestitures: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Accounts payable Increase (Decrease) in Accounts Payable Prepaid expenses, inventories and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accrued expenses and other liabilities Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash Flows from Investing Activities: Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Acquisitions, net of cash acquired Acquisition related additions to property, plant and equipment Payments To Acquire Acquisition Related Property Plant And Equipment The cash outflow associated with the acquisition of long-lived, physical assets that are the direct result of an acquisition that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Payments on landfill operating lease contracts Payments For Landfill Operating Lease The cash outflow associated with landfill operating agreements consisting of up-front or one-time payments, future minimum rental payments, including success/expansion fees, other direct costs and capping, closure and post closure costs. Proceeds from divestiture transactions Proceeds from Sales of Business, Affiliate and Productive Assets Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from property insurance settlement Proceeds from Insurance Settlement, Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash Flows from Financing Activities: Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Proceeds from long-term borrowings Proceeds from Issuance of Long-term Debt and Capital Securities, Net Principal payments on long-term debt Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Change in restricted cash Proceeds from (Repayments of) Restricted Cash, Financing Activities Payments of debt issuance costs Payments of Debt Issuance Costs Payments of debt extinguishment costs Payment for Debt Extinguishment or Debt Prepayment Cost Proceeds from the exercise of share based awards Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Excess tax benefit on the vesting of share based awards Excess Tax Benefit from Share-based Compensation, Financing Activities Distribution to noncontrolling interest holders Proceeds from (Payments to) Noncontrolling Interests Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net (decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Supplemental Disclosures of Cash Flow Information: Supplemental Cash Flow Elements [Abstract] Interest Interest Paid, Net Income taxes, net of refunds Income Taxes Paid, Net Supplemental Disclosures of Non-Cash Investing and Financing Activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-current assets acquired through long-term obligations Fair Value of Assets Acquired Interest expense on long-term debt and capital leases Interest Expense, Debt, Excluding Amortization Letter of credit fees Letters Of Credit Fees Amount of letters of credit fees included in interest expense. Less: capitalized interest Interest Costs Capitalized Adjustment Total interest expense Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Covenants Not-to-Compete Noncompete Agreements [Member] Client Lists Customer Lists [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Intangible assets Finite-Lived Intangible Assets, Gross Less accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible assets, net Intangible amortization expenses Amortization of Intangible Assets Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Disposal Group, Not Discontinued Operations Disposal Group, Not Discontinued Operations [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Maine Energy Facility Maine Energy Facility [Member] Maine energy facility. Casella-Altela Regional Environmental Services, LLC Casella Altela Regional Environmental Services LLC [Member] Casella-Altela Regional Environmental Services, LLC ("CARES") Cares Cares [Member] Cares [Member] Altela, Inc. Altela Inc [Member] Altela,Inc. Equipment and Real Estate Property, Plant and Equipment, Other Types [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Consideration received from sale of assets Divestiture Amount Business Consideration Received Amount of consideration received for selling a business. Gain (loss) on disposal Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Undiscounted purchase consideration Disposal Group, Including Discontinued Operation, Consideration Undiscounted purchase consideration paid in installments Period Over Which Consideration For Sale Of Disposal Group Assets To Be Received Period over which consideration for sale of disposal group assets to be received. Remaining divestiture costs Membership interest Noncontrolling Interest, Ownership Percentage by Parent Impairment charge Asset Impairment Charges Proceeds from sale of assets Membership interest Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Revenue Business Acquisition, Pro Forma Revenue Operating (loss) income Business Acquisitions Pro Forma Operating Income Loss The pro forma operating income for the period as if the business combination or combinations had been completed at the beginning of the period. Net loss attributable to common stockholders Business Acquisition, Pro Forma Net Income (Loss) Basic net loss per common share attributable to common stockholders (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted net loss per common share attributable to common stockholders (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Basic and diluted weighted average shares outstanding (in shares) Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Numerator: Loss before income taxes Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Denominator: Unvested restricted stock (in shares) Weighted Average Number of Shares, Contingently Issuable Effect of weighted average shares outstanding (in shares) Weighted Average Number of Shares Issued, Basic Weighted average common shares outstanding (in shares) Antidilutive potentially issuable shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount For the fiscal year ending December 31, 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months For the fiscal year ending December 31, 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two For the fiscal year ending December 31, 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three For the fiscal year ending December 31, 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four For the fiscal year ending December 31, 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts Allowance for Doubtful Accounts [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at beginning of period Valuation Allowances and Reserves, Balance Additions—charged to expense Valuation Allowances and Reserves, Additions for Charges to Cost and Expense Deductions—bad debts written off, net of recoveries Valuation Allowances and Reserves, Deductions Balance at end of period Depreciation expense Depreciation Amortization expense Amortization Depletion expense on operating lease contracts Summary of Financial Information by Reportable Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of Revenue Attributable to Services Provided by Company Revenue from External Customers by Products and Services [Table Text Block] BASIS OF PRESENTATION Business Description and Basis of Presentation [Text Block] Number of plans Multiemployer Plans, Number of Plans Multiemployer Plans, Number of Plans Intangible assets, useful life (no more than) Components of Property, Plant and Equipment Summary of Stock Option Activity Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Fair Value of Stock Options Weighted Average Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Reclassification Out of Accumulated Other Comprehensive Income (Loss) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Assets and Liabilities Measured at Fair Value on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]