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Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 ("FAME Bonds 2015R-2") due August 2035 - fixed rate interest period through 2025; bearing interest at 4.375% Finance Authority Of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 [Member] Finance Authority Of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 [Member] Non-current assets obtained through long-term financing obligations Fair Value of Assets Acquired Business Combination and Asset Acquisition [Abstract] 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 Fair value of stock awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Business Acquisition [Axis] Business Acquisition [Axis] Revenue from External Customer [Line Items] Revenue from External Customer [Line Items] Cash Flow Hedging Cash Flow Hedging [Member] Title of Individual [Domain] Title of Individual [Domain] Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Award Type [Domain] Award Type [Domain] Credit Facility [Domain] Credit Facility [Domain] ASSETS Assets: Assets [Abstract] Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Exercisable at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Proceeds from the exercise of share based awards Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Beginning balance, outstanding (in shares) Ending balance, outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Entity Address, City or Town Entity Address, City or Town Trade Names Trade Names [Member] Accumulated Deficit Retained Earnings [Member] Debt Instrument [Axis] Debt Instrument [Axis] Prepaid expenses, inventories and other assets Increase (Decrease) in Prepaid Expense and Other Assets Fixed rate debt Debt Instrument, Fair Value Disclosure Accretion expense Asset Retirement Obligation, Accretion Expense OTHER ITEMS AND CHARGES Unusual or Infrequent Items, or Both, Disclosure [Text Block] 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. 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Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Four Finite-Lived Intangible Asset, Expected Amortization, after Year Four 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] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Diluted earnings per share attributable to common stockholders: Earnings Per Share, Diluted [Abstract] Entity Current Reporting Status Entity Current Reporting Status Cumulative effect of new accounting principle Cumulative Effect, Period of Adoption, Adjustment [Member] New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 ("New York Bonds 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] Common stock, authorized shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Number of citizens seeking damages Loss Contingency, Number of Plaintiffs Site Contingency [Line Items] Site Contingency [Line Items] Votes per share held (in votes) Stockholders' Equity, Votes per Share Held Stockholders' Equity, Votes per Share Held Total Business Combination, Consideration Transferred Principal amount of debt Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Current maturities of debt Less—current maturities of debt Long-term Debt and Lease Obligation, Current Plan Name [Axis] Plan Name [Axis] Total assets Assets, Fair Value Disclosure Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 ("FAME Bonds 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] Document Transition Report Document Transition Report Accrued capping, closure and post-closure costs, less current portion Accrued Capping, Closure, Post-closure and Environmental Costs, Noncurrent Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Accrued Final Capping, Closure and Post Closure Asset Retirement Obligation [Policy Text Block] Total liabilities and stockholders' equity Liabilities and Equity Other accrued liabilities Other Accrued Liabilities, Current Unvested Share-based Payment Arrangement, Tranche One [Member] Contract liabilities Contract with Customer, Liability, Current Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Covenants Not-to-Compete Noncompete Agreements [Member] Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Landfill Landfill Revenue [Member] Landfill Revenue [Member] Proceeds from debt borrowings Proceeds from Issuance of Long-term Debt and Capital Securities, Net LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Southbridge Landfill closure charge Southbridge Landfill Closure Charge The aggregate (recovery) charge recognized in the period associated with the unplanned closure of the Southbridge Landfill. 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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] Business Acquisition [Line Items] Business Acquisition [Line Items] Income Statement [Abstract] Amendment Flag Amendment Flag Fair Value Estimate of Fair Value Measurement [Member] ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE Asset Retirement Obligation Disclosure [Text Block] Diluted earnings per common share (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted 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] 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Weighted average Weighted Average [Member] Entity Address, State or Province Entity Address, State or Province MADEP and Casella Waste Systems Massachusetts Department of Environmental Protection (MADEP) and Casella Waste Systems [Member] Massachusetts Department of Environmental Protection (MADEP) and Casella Waste Systems [Member] Income before income taxes Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Document Information [Table] Document Information [Table] Non-cash expense from acquisition activities Non-Cash Expense From Acquisition Activities The non-cash portion of the aggregate amount of expense associated with legal, consulting and other similar costs recognized during the accounting period associated with the acquisition and integration of acquired businesses or select development projects Corporate entities Corporate, Non-Segment [Member] Segment Reporting [Abstract] Entity [Domain] Entity [Domain] Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] Buildings and improvements Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings Useful life of finite lived intangible assets Finite-Lived Intangible Asset, Useful Life Use of Estimates Use of Estimates, Policy [Policy Text Block] Summary of Earnings per Share Computation Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Non-processing Non-Processing Services [Member] Non-Processing Services Entity Shell Company Entity Shell Company Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Local Phone Number Local Phone Number Other comprehensive income (loss), net of tax Hedging activity Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Number of additional shares (in shares) Additional Shares Issued Maximum Attainment Level Additional shares of Class A Common Stock potentially issuable if maximum attainment levels are met. 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Amortization, Remainder of Fiscal Year Land Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Cost of operations Cost of Goods and Services Sold Term Loan Facility Term Facility due 2023 (Term Loan A Facility) [Member] Term Facility due 2023 (Term Loan A Facility) [Member] Class B Common Stock Common Class B [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Other comprehensive income OCI, before Reclassifications, before Tax, Attributable to Parent Stock Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Risk free interest (as a percent) Accrual for Environmental Loss Contingencies, Discount Rate Cash Flows from Investing 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