00100 - Statement - CONSOLIDATED BALANCE SHEETS
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00200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS
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00300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME
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00400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS
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40502 - Disclosure - BUSINESS COMBINATIONS - Preliminary fair value estimates of assets acquired and liabilities assumed recognized (Details)
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40601 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS - Changes in AOCI (Details)
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40907 - Disclosure - LEASES - Future maturity of lease liability and its present value (Details) (Calc 2)
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41001 - Disclosure - RECEIVABLES (Details)
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41101 - Disclosure - PROPERTY AND EQUIPMENT (Details)
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41202 - Disclosure - LEASES - Leased assets and liabilities (Details)
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41203 - Disclosure - LEASES - Lease cost (Details)
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41206 - Disclosure - LEASES - Maturity analysis of operating and finance lease liabilities (Details)
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41302 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details)
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41503 - Disclosure - CLOSURE AND POST-CLOSURE OBLIGATIONS - Rollforward (Details)
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41601 - Disclosure - DEBT - Schedule (Details)
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41602 - Disclosure - DEBT - Future Maturities (Details)
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41701 - Disclosure - INCOME TAXES (Details)
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41702 - Disclosure - INCOME TAXES - DEFERRED TAX ASSETS AND LIABILITIES (Details)
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41907 - Disclosure - EQUITY - Share-based Compensation Expense (Details)
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42001 - Disclosure - EARNINGS PER SHARE (Details)
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42102 - Disclosure - SEGMENT REPORTING - Reconciliation of EBITDA (Details)
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00090 - Document - Document and Entity Information
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00105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)
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00305 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Parenthetical)
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00500 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
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00505 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)
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10101 - Disclosure - DESCRIPTION OF BUSINESS
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10201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
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10301 - Disclosure - USE OF ESTIMATES
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10501 - Disclosure - BUSINESS COMBINATIONS
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10601 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS
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10701 - Disclosure - DISCLOSURE OF SUPPLEMENTAL CASH FLOW INFORMATION
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10801 - Disclosure - FAIR VALUE MEASUREMENTS
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10901 - Disclosure - CONCENTRATIONS AND CREDIT RISK
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11001 - Disclosure - RECEIVABLES
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11101 - Disclosure - PROPERTY AND EQUIPMENT
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11301 - Disclosure - GOODWILL AND INTANGIBLE ASSETS
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11401 - Disclosure - EMPLOYEE BENEFIT PLANS
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11501 - Disclosure - CLOSURE AND POST-CLOSURE OBLIGATIONS
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11601 - Disclosure - DEBT
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11701 - Disclosure - INCOME TAXES
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11801 - Disclosure - COMMITMENTS AND CONTINGENCIES
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11901 - Disclosure - EQUITY
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12001 - Disclosure - EARNINGS PER SHARE
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12101 - Disclosure - SEGMENT REPORTING
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20202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)
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30203 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
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30503 - Disclosure - BUSINESS COMBINATIONS (Tables)
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30603 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
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30703 - Disclosure - DISCLOSURE OF SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
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30803 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)
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31003 - Disclosure - RECEIVABLES (Tables)
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31103 - Disclosure - PROPERTY AND EQUIPMENT (Tables)
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31303 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables)
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31403 - Disclosure - EMPLOYEE BENEFIT PLANS (Tables)
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31503 - Disclosure - CLOSURE AND POST-CLOSURE OBLIGATIONS (Tables)
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31603 - Disclosure - DEBT (Tables)
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31703 - Disclosure - INCOME TAXES (Tables)
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31903 - Disclosure - EQUITY (Tables)
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32003 - Disclosure - EARNINGS PER SHARE (Tables)
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32103 - Disclosure - SEGMENT REPORTING (Tables)
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40101 - Disclosure - DESCRIPTION OF BUSINESS (Details)
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40201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details)
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40204 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details)
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40206 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible Assets (Details)
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40207 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Debt Issuance Costs & Debt Discount (Details)
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40401 - Disclosure - REVENUES (Details)
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40402 - Disclosure - REVENUES - Treatment and Disposal Revenue (Details)
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40403 - Disclosure - REVENUES - Geography (Details)
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40501 - Disclosure - BUSINESS COMBINATIONS - Merger consideration (Details)
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40503 - Disclosure - BUSINESS COMBINATIONS - preliminary fair value of identifiable intangible assets (Details)
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40504 - Disclosure - BUSINESS COMBINATIONS - Pro forma information (Details)
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40505 - Disclosure - BUSINESS COMBINATIONS - Additional Information (Details)
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40602 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS -Reclassifications Line Items (Details)
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40701 - Disclosure - DISCLOSURE OF SUPPLEMENTAL CASH FLOW INFORMATION (Details)
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40801 - Disclosure - FAIR VALUE MEASUREMENTS (Details)
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40802 - Disclosure - FAIR VALUE MEASUREMENTS - Changes in Level 3 liabilities measured at fair value (Details)
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40901 - Disclosure - CONCENTRATIONS AND CREDIT RISK (Details)
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41201 - Disclosure - LEASES (Details)
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41301 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Goodwill (Details)
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41303 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Future amortization expense (Details)
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41401 - Disclosure - EMPLOYEE BENEFIT PLANS (Details)
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41501 - Disclosure - CLOSURE AND POST-CLOSURE OBLIGATIONS (Details)
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41502 - Disclosure - CLOSURE AND POST-CLOSURE OBLIGATIONS - FAIR VALUE ASSUMPTIONS (Details)
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41504 - Disclosure - CLOSURE AND POST-CLOSURE OBLIGATIONS - CHANGES (Details)
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41603 - Disclosure - DEBT - Paragraph (Details)
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41604 - Disclosure - DEBT - Loan Interest Margin (Details)
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41605 - Disclosure - DEBT - Leverage Ratio (Details)
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41703 - Disclosure - INCOME TAXES - DOMESTIC AND FOREIGN COMPONENTS (Details)
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41801 - Disclosure - COMMITMENTS AND CONTINGENCIES - Litigation and Regulatory Proceedings (Details)
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41901 - Disclosure - EQUITY - Equity Based Purchase Consideration (Details)
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41902 - Disclosure - EQUITY - Stock Repurchase Program (Details)
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41903 - Disclosure - EQUITY - Omnibus Incentive Plan (Details)
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41904 - Disclosure - EQUITY - PSUs, Restricted Stock and RSU (Details)
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41905 - Disclosure - EQUITY - Stock Options (Details)
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41906 - Disclosure - EQUITY - Treasury Stock (Details)
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42101 - Disclosure - SEGMENT REPORTING - Summarized Financial Information (Details)
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42103 - Disclosure - SEGMENT REPORTING - Revenue and Long-lived Assets (Details)
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00405 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS - (Restricted cash and investments)
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10401 - Disclosure - REVENUES
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11201 - Disclosure - LEASES
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30403 - Disclosure - REVENUES (Tables)
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31203 - Disclosure - LEASES (Tables)
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40202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash and Investments (Details)
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40203 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Revenue (Details)
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40205 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disposal Cell Accounting (Details)
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40208 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Derivative Instruments (Details)
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40209 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details)
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40210 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Insurance (Details)
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40404 - Disclosure - REVENUES - Practical Expedients (Details)
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41204 - Disclosure - LEASES - Supplemental Cash Flow information (Details)
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41205 - Disclosure - LEASES - Weighted-average remaining lease term and discount rate (Details)
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41908 - Disclosure - EQUITY - Warrants (Details)
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