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A positive number is an expense and a negative number is a gain. 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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. COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Contingent liability term Multiemployer Plans, Withdrawal Obligation, Contingent Liability Term Multiemployer Plans, Withdrawal Obligation, Contingent Liability Term Related Party [Axis] Related Party [Axis] Accumulated other comprehensive loss, interest rate swaps, net Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, Unrealized Gain (Loss) Arising During Period, after Tax Secured Debt Secured Debt [Member] Salary employees Salary Employee [Member] Salary Employee Schedule of Environmental Remedial Liability Schedule of Environmental Loss Contingencies by Site [Table Text Block] Estimate of total undiscounted costs associated with implementing the preferred remedies Undiscounted Costs Preferred Remedies Estimated undiscounted remediation costs. 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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] Common stock, authorized shares Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Operating cash flows for operating leases Operating Lease, Payments Total Business Combination, Consideration Transferred Total Federal Income Tax Expense (Benefit), Continuing Operations Additions - charged to expense Accounts Receivable, Credit Loss Expense (Reversal) Principal amount of debt Aggregate principal amount outstanding Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Total Assets, Fair Value Disclosure Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 (FAME Bonds 2015R-1) Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 (FAME Bonds 2015R-1) [Member] Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 (FAME Bonds 2015R-1) Denominator: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Total liabilities and stockholders' equity Liabilities and Equity Other accrued liabilities Other Accrued Liabilities, Current Contract liabilities Contract with Customer, Liability, Current Fiscal year ending December 31, 2026 Lessee, Operating Lease, Liability, to be Paid, Year Five Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Shares to be issued - acquisition (in shares) Weighted Average Number of Shares, Contingently Issuable Supplemental Disclosures of Cash Flow Information: Supplemental Cash Flow Elements [Abstract] Income benefit associated with stock-based compensation expense Share-based Payment Arrangement, Exercise of Option, Tax Benefit Landfill Landfill Revenue [Member] Landfill Revenue [Member] Proceeds from debt borrowings Proceeds from Issuance of Long-term Debt and Capital Securities, Net Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] BASIS OF PRESENTATION Business Description and Basis of Presentation [Text Block] State State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] EARNINGS PER SHARE Earnings Per Share [Text Block] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Minimum Minimum [Member] Fiscal year ending December 31, 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Letters of credit sublimit Letters of Credit, Sublimit Sublimit to the amount of letters of credit allowed under credit agreement. Forfeited or expired (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Less—unamortized discount and debt issuance costs Debt Issuance Costs, Net Preferred stock authorized to issue (up to) (in shares) Preferred Stock, Shares Authorized Amended and Restated Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility") Amended Revolving Credit Facility and Term Loan A Facility [Member] Amended Revolving Credit Facility and Term Loan A Facility Net leverage ratio Debt Instrument, Covenant Compliance, Net Leverage Ratio Debt Instrument, Covenant Compliance, Net Leverage Ratio Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Proceeds from property insurance settlement Proceeds from Insurance Settlement, Investing Activities Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds [Member] Vermont Economic Development Authority (VEDA) Solid Waste Disposal Revenue Bonds Fiscal year ending December 31, 2025 Long-Term Debt, Maturity, Year Four Issuance of Class A common stock - equity offering Stock Issued During Period, Value, New Issues Revenue Recognition Revenue [Policy Text Block] Acquisitions, net of cash acquired Cash used in acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired DEBT Debt Disclosure [Text Block] Schedule of Benefit for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Environmental remediation charge Environmental Remediation Expense Line of Credit Line of Credit [Member] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Lease Accounting Lessee, Leases [Policy Text Block] ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES Credit Loss, Financial Instrument [Text Block] Accumulated depreciation and amortization Less: accumulated depreciation and amortization Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Purchase Price: Payments to Acquire Businesses, Net of Cash Acquired [Abstract] Issuance of Class A common stock - equity offering (in shares) Stock Issued During Period, Shares, New Issues Other non-cash consideration Business Combination, Consideration Transferred, Other Employee Stock Purchase Plan [Line Items] Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] Letters of credit Outstanding irrevocable letters of credit totaling Letters of Credit Outstanding, Amount Summary of Revenue Attributable to Services Provided by Company Revenue from External Customers by Products and Services [Table Text Block] Reversal of pension costs Pension Cost (Reversal of Cost) Components of Interest Expense Interest Income and Interest Expense Disclosure [Table Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Other expense, net Nonoperating Income (Expense) Acquisitions Goodwill, Acquired During Period Basis of Accounting Basis of Accounting, Policy [Policy Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Fiscal year ending December 31, 2026 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Five Self-Insurance Liabilities and Related Costs Unpaid Policy Claims and Claims Adjustment Expense, Policy [Policy Text Block] Accumulated other comprehensive loss, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company Accounts receivable - trade, allowance for credit losses Balance at beginning of period Balance at end of period Accounts Receivable, Allowance for Credit Loss, Current Landfills Landfills [Member] Landfills. Payments of debt issuance costs Payments of Debt Issuance Costs Interest rate swap settlements Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Settlements, before Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Settlements, before Reclassification and Tax Auditor Name Auditor Name Cover [Abstract] Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Operating and Financing Activities, Lessee [Abstract] Cash Flow, Operating and Financing Activities, Lessee [Abstract] Total operating expenses Costs and Expenses Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Less: interest expense Lessee, Operating Lease, Liability, Undiscounted Excess Amount Environmental remediation charge Environmental Costs Recognized, Recovery Credited to Expense 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] Hourly employees Hourly Employee [Member] Hourly Employee Less: interest expense Finance Lease, Liability, Undiscounted Excess Amount Document Information [Table] Document Information [Table] Carrying Value Reported Value Measurement [Member] Fiscal year ending December 31, 2026 Finance Lease, Liability, to be Paid, Year Five Common Stock Common Stock [Member] Surety bond Surety Bonds Amount of surety bonds that are available for the future payment of landfill capping, closure and post-closure obligations. Operating income Operating income (loss) Operating Income (Loss) 2016 Incentive Plan 2016 Incentive Plan [Member] 2016 Incentive Plan Current operating lease liabilities Operating Lease, Liability, Current Fiscal year ending December 31, 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Two Hedging Designation [Axis] Hedging Designation [Axis] Power generation Solid Waste Operations Power Generation [Member] Solid Waste Operations Power Generation [Member] Stock-based compensation Share-based Payment Arrangement, Noncash Expense AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Depreciation expense Depreciation Unregistered Sale Unregistered Sale [Member] Unregistered Sale Income tax benefit related to items in other comprehensive income (loss) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Accrued expenses, contract liabilities and other liabilities Increase (Decrease) in Accrued Liabilities Schedule of Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Table Text Block] Notional amount Derivative, Notional Amount Federal effect of change in state valuation allowance Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Legal and transaction costs Legal Fees Credit Loss [Abstract] Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Fiscal year ending December 31, 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Aggregate intrinsic value, outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Estimated accumulated benefit obligation as complete withdrawal Multiemployer Plans, Complete Withdrawal, Estimated Accumulated Benefit Obligation Multiemployer Plans, Complete Withdrawal, Estimated Accumulated Benefit Obligation Collection Collection [Member] Collection [Member] Consolidation Items [Axis] Consolidation Items [Axis] Measurement Input Type [Axis] Measurement Input Type [Axis] Common stock, issued shares Common Stock, Shares, Issued Shares issued Preferred Stock, Shares Issued Fiscal year ending December 31, 2023 Accrual for Environmental Loss Contingency, Undiscounted, to be Paid, Year Two Allocated as follows: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Entity Address, City or Town Entity Address, City or Town Capitalized interest Interest Costs Capitalized Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Multiemployer Plan Type [Axis] Retirement Plan Type [Axis] Closure and post-closure costs incurrence period Closure and Post-Closure Costs Incurrence Period Closure and Post-Closure Costs Incurrence Period Balance Sheet Location [Axis] Balance Sheet Location [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Interest expense Total interest expense Interest Expense Fiscal year ending December 31, 2022 Finance Lease, Liability, to be Paid, Year One Accumulated deficit Retained Earnings (Accumulated Deficit) Beginning balance Ending balance Accrued costs associated with post-closure obligations Asset Retirement Obligation Options granted period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Litigation Case [Domain] Litigation Case [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Stock issued under stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Entity Filer Category Entity Filer Category Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625% 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] Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Fair Value Estimate of Fair Value Measurement [Member] FINAL CAPPING, CLOSURE AND POST-CLOSURE COSTS Asset Retirement Obligation Disclosure [Text Block] Less: capitalized interest Interest Costs Capitalized Adjustment Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 ("FAME Bonds 2015R-1") due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125% Finance Authority Of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 [Member] Finance Authority Of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 [Member] Resource Solutions operations Resource Solutions Operations [Member] Resource Solutions Operations ACCOUNTING CHANGES Accounting Standards Update and Change in Accounting Principle [Text Block] Other non-current assets Other Noncurrent Assets [Member] Fiscal year ending December 31, 2023 Finance Lease, Liability, to be Paid, Year Two 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 New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 ("New York Bonds 2020") due September 2050 - fixed rate interest period through 2025; bearing interest at 2.750% Revenue Bonds Series 2020 due September 2050 [Member] Revenue Bonds Series 2020 due September 2050 Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Amendment Flag Amendment Flag Equity Components [Axis] Equity Components [Axis] Restricted Stock Awards Restricted Stock Awards [Member] Restricted Stock Awards [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Rebate for Recycled or Returned Organic Materials Rebate, Recycled or Returned Organic Materials [Member] Rebate, Recycled or Returned Organic Materials Interest Rate Swaps Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Sale of Stock [Domain] Sale of Stock [Domain] Schedule of Limited Partners' Capital Account by Class [Table] Schedule of Limited Partners' Capital Account by Class [Table] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Summary of Financial Information by Reportable Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Deferred Deferred Federal Income Tax Expense (Benefit) 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] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Decrease in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Product and Service [Axis] Product and Service [Axis] Maximum exposure automobile plan per individual event Maximum Exposure Self Insured Maximum exposure per individual event. Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Entity Public Float Entity Public Float Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Landfills Landfill [Member] Short-term lease cost Short-term Lease, Cost Issuances of Class A common stock (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Floor interest rate Derivative, Floor Interest Rate Additional shares issued Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Schedule of Multiemployer Plans [Table] Multiemployer Plan [Table] Statement [Line Items] Statement [Line Items] Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Accrued expenses and reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Amount awarded to other party Litigation Settlement, Amount Awarded to Other Party Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Estimate of inflation rate Inflation Rate Estimated inflation rate. Issuances of Class A common stock Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Total services purchased Related Party Transaction, Purchases from Related Party Federal Domestic Tax Authority [Member] Multiemployer Plans Type [Domain] Retirement Plan Type [Domain] Eastern Eastern Region [Member] Eastern region. Debt Disclosure [Abstract] Debt Disclosure [Abstract] Amended and Restated Term Loan A Facility due December 2026 ("Term Loan Facility"); bearing interest at LIBOR plus 1.375% Amended Term A Facility Due December 2026 (Term Loan B Facility) [Member] Amended Term A Facility Due December 2026 (Term Loan B Facility) MADEP Massachusetts Department of Environmental Protection (MADEP) and Casella Waste Systems [Member] Massachusetts Department of Environmental Protection (MADEP) and Casella Waste Systems [Member] Accounts Receivable, Net of Allowance for Credit Losses Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Southbridge Landfill non-cash closure (credit) charge, net Landfill closure project (credit) charge Landfill Closure Project (Credit) Charge (Credit) charge associated with changes in the estimated costs to execute the closure plan. Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Valuation allowance Less: valuation allowance Deferred Tax Assets, Valuation Allowance Corporate Entities Corporate, Non-Segment [Member] Outstanding accounts payable Accounts Payable, Related Parties, Current Buildings Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings Less discount, net Accrual for Environmental Loss Contingencies, Discount EMPLOYEE BENEFIT PLANS Retirement Benefits [Text Block] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Document Annual Report Document Annual Report Total State and Local Income Tax Expense (Benefit), Continuing Operations 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. Public Stock Offering Public Stock Offering [Member] Public Stock Offering [Member] Term Loan A Facility due May 2023 amended and restated in December 2021; bore interest at LIBOR plus 1.75% Term Loan Facility Due May 2023 [Member] Term Loan Facility Due May 2023 Proceeds from the public offering of Class A Common Stock Proceeds from Issuance of Common Stock Tax effect related to items of other comprehensive income (loss) Other Comprehensive Income (Loss), Tax Total assets Total assets Assets Unvested restricted stock (in shares) Weighted Average Number of Shares, Restricted Stock Plan Name [Domain] Plan Name [Domain] Interest Interest Paid, Excluding Capitalized Interest, Operating Activities Basic earnings per share attributable to common stockholders: Net Income (Loss) Attributable to Parent [Abstract] Western Western Region [Member] Western region. 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