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Obligations incurred Accrual for Environmental Loss Contingencies, Charges to Expense for New Losses Outstanding aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Accounting Changes and Error Corrections [Abstract] Issuance of Class A common stock (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Registrant Name Entity Registrant Name Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities Schedule of Change in Asset Retirement Obligation [Table Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Dilutive effect of stock options and other stock awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Fiscal year ending December 31, 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Processing Solid Waste Operations Processing [Member] Solid Waste Operations Processing [Member] Beginning balance Ending balance Accrual for Environmental Loss Contingencies Adjustment to Compensation, Amount Adjustment to Compensation Amount Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Contingent consideration, decrease for reversal of contingency Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Principal payments on debt Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security Resource Solutions Resource Solutions Region [Member] Resource Solutions Region [Member] Document Period End Date Document Period End Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Adoption Date Trading Arrangement Adoption Date Accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Summary of Financial Assets and Liabilities Measured at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Exercisable at end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted-average discount rate - finance leases Finance Lease, Weighted Average Discount Rate, Percent Schedule of Unaudited Pro forma Combined Information Business Acquisition, Pro Forma Information [Table Text Block] Entity Central Index Key Entity Central Index Key Amounts Reclassified Out of Accumulated Other Comprehensive Income, Net of Tax Reclassification out of Accumulated Other Comprehensive Income [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Loss contingency accrual Loss Contingency Accrual Number of wholly owned subsidiaries acquired Number Of Wholly Owned Subsidiaries Acquired Number Of Wholly Owned Subsidiaries Acquired Stock-based compensation expense Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Intangible assets Finite-Lived Intangible Assets, Gross Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Fixed Rate Bonds Fixed Rate Bonds [Member] Fixed rate bonds. Contractual term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Designated as Hedging Instrument Designated as Hedging Instrument [Member] Basic earnings per common share (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Accrued payroll and related expenses Employee-related Liabilities, Current Vesting [Axis] Vesting [Axis] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] John W. Casella [Member] John W. Casella Name Trading Arrangement, Individual Name Other comprehensive income, net of tax Hedging activity Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Accretion expense Asset Retirement Obligation, Accretion Expense Processing Resource Solutions Operations, Processing [Member] Resource Solutions Operations, Processing Issuance of Class A common stock - equity offering, net of stock issuance costs Stock Issued During Period, Value, New Issues Equity [Abstract] Total revenues Rebates Revenue from Contract with Customer, Excluding Assessed Tax Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Cash flow hedge derivatives, gross asset Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Other comprehensive income, before tax: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Sean M. Steves [Member] Sean M. Steves Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Acquisitions, net of cash acquired Cash used in acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Cash interest payments Interest Paid, Excluding Capitalized Interest, Operating Activities Credit Facility [Domain] Credit Facility [Domain] Variable rate margin Debt Instrument, Basis Spread on Variable Rate Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Weighted average common shares outstanding, diluted (in shares) Weighted average common shares outstanding, diluted (in shares) Diluted weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Landfill Landfill [Member] Total Interest Rate Contract [Member] Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE Asset Retirement Obligation Disclosure [Text Block] Common stock, additional authorized shares (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Shelley E. Sayward [Member] Shelley E. Sayward REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Effect of weighted average shares outstanding (in shares) Weighted Average Number of Shares Issued, Basic Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Additional paid-in capital Additional Paid in Capital, Common Stock Non-current assets obtained through long-term financing obligations Fair Value of Assets Acquired Additional Paid-In Capital Additional Paid-in Capital [Member] Impact of potentially dilutive securities: Weighted Average Number of Shares Outstanding, Diluted, Adjustment [Abstract] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Total assets Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Less: capitalized interest Interest Costs Capitalized Adjustment Loss Contingencies [Line Items] Loss Contingencies [Line Items] Cover [Abstract] Number of states in which entity operates Number of States in which Entity Operates Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Amortization of debt issuance costs Amortization of debt issuance costs Amortization of Debt Issuance Costs SOFR Secured Overnight Financing Rate (SOFR) [Member] Secured Overnight Financing Rate (SOFR) Recurring Fair Value, Recurring [Member] Number of businesses acquired Number of Businesses Acquired Other long-term liabilities Other Liabilities, Noncurrent Class A Common Stock 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 Non-NEOs Non-NEOs [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Forward Starting Interest Rate Contract, Forward Starting [Member] Interest Rate Contract, Forward Starting Other comprehensive income, before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Non Employee Director Non Employee Director [Member] Non Employee Director [Member] Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Cash Flow Hedging Cash Flow Hedging [Member] SEGMENT REPORTING Segment Reporting Disclosure [Text Block] Net increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Limited Partners' Capital Account [Line Items] Limited Partners' Capital Account [Line Items] Secured Debt Secured Debt Secured Debt [Member] Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Disposition of assets, other items and charges, net Loss (Gain) On Disposition Of Assets And Other Noncash Expense (Income) Loss (gain) on the sale of property and equipment, the noncash portion of Southbridge landfill closure charge, and the noncash portion of expense from acquisition activities, net. Expense from acquisition activities Expense from Acquisition Activities 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 Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Weighted average common shares outstanding, basic (in shares) Weighted average common shares outstanding, basic (in shares) Basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Operating income Operating income (loss) Operating Income (Loss) Edmond "Ned" R. Coletta [Member] Edmond "Ned" R. Coletta Bridge loan Bridge Loan Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] National Accounts National Accounts [Member] National Accounts Obligations incurred Asset Retirement Obligation, Liabilities Incurred Proceeds from the exercise of share based awards Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Segments [Axis] Segments [Axis] Statement [Line Items] Statement [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Floor interest rate (as a percent) Derivative, Floor Interest Rate Inactive waste disposal site Inactive Waste Disposal Site [Member] Inactive Waste Disposal Site Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Schedule of Debt Schedule of Debt [Table Text Block] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Line of credit drawn Long-Term Line of Credit Customer Relationships Customer Relationships [Member] Long-term portion Accrued Environmental Loss Contingencies, Noncurrent Derivative Asset, Statement Of Financial Position Extensible Enumeration, Not Disclosed Flag Derivative Asset, Statement Of Financial Position Extensible Enumeration, Not Disclosed Flag Derivative Asset, Statement Of Financial Position Extensible Enumeration, Not Disclosed Flag STOCKHOLDERS' EQUITY: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Unvested Share-Based Payment Arrangement, Tranche One [Member]