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LONG-TERM DEBT - Narrative (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 06, 2020
Feb. 25, 2020
Apr. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]                  
Increase in pricing tier percent based on leverage ratio of greater than 4.50 to 1.00   0.125%              
Unamortized Debt Issuance Expense       $ 12,300,000     $ 12,300,000   $ 14,200,000
Divestiture of principal repayments             23,500,000 $ 38,200,000  
Repayments of Unsecured Debt             0 1,075,000,000.0  
Loss on early extinguishment of debt       0 $ 0   0 $ 23,100,000  
Private Placement Notes                  
Debt Instrument [Line Items]                  
Repayments of Unsecured Debt           $ 1,075,000,000.000      
Loss on early extinguishment of debt           (23,100,000)      
Premiums payable           (20,400,000)      
Write-off of unamortized debt issuance costs           2,700,000      
Domestic Environmental Solutions Less Retained Business                  
Debt Instrument [Line Items]                  
Divestiture of principal repayments     $ 430,000,000.0            
Decrease of maximum consolidated leverage ratio 25.00%                
Senior Notes Facility Due 2024 | Senior Notes                  
Debt Instrument [Line Items]                  
Unamortized Debt Issuance Expense           7,100,000      
Aggregate principal amount           600,000,000.0      
Quarter Ending on or Before December 31, 2021 | Domestic Environmental Solutions Group | Domestic Environmental Solutions Less Retained Business                  
Debt Instrument [Line Items]                  
Maximum consolidated leverage ratio   475.00%              
Quarter Ending on or Before December 31, 2021 | Maximum                  
Debt Instrument [Line Items]                  
Maximum consolidated leverage ratio   500.00%              
Quarter Ending on or Before December 31, 2021 | Maximum | Domestic Environmental Solutions Less Retained Business                  
Debt Instrument [Line Items]                  
Maximum consolidated leverage ratio 475.00%                
Quarter Ending on or After March 31, 2022 | Domestic Environmental Solutions Group | Domestic Environmental Solutions Less Retained Business                  
Debt Instrument [Line Items]                  
Maximum consolidated leverage ratio   425.00%              
Quarter Ending on or After March 31, 2022 | Maximum                  
Debt Instrument [Line Items]                  
Maximum consolidated leverage ratio   450.00%              
Quarter Ending on or After March 31, 2022 | Maximum | Domestic Environmental Solutions Less Retained Business                  
Debt Instrument [Line Items]                  
Maximum consolidated leverage ratio 425.00%                
Period Through December 31, 2020 | Term Loan Facility                  
Debt Instrument [Line Items]                  
Allowed additional cash back to EBITDA   $ 200,000,000.0              
Period until December 31, 2021 | Term Loan Facility                  
Debt Instrument [Line Items]                  
Allowed additional cash back to EBITDA   $ 100,000,000.0              
Fiscal Quarter After March 31, 2022 and Thereafter | Domestic Environmental Solutions Less Retained Business                  
Debt Instrument [Line Items]                  
Maximum consolidated leverage ratio   450.00%              
Fifth Amendment                  
Debt Instrument [Line Items]                  
Unamortized Debt Issuance Expense       $ 1,700,000     1,700,000    
Interest expense             $ 400,000    
1.4 years and 1.6 years | Maximum | Term Loan Facility                  
Debt Instrument [Line Items]                  
Maximum consolidated leverage ratio       375.00%     475.00%    
Fourth Amendment                  
Debt Instrument [Line Items]                  
Interest expense           200,000      
Issuance cost           $ 2,000,000.0      
Level 2                  
Debt Instrument [Line Items]                  
Estimated fair value of debt       $ 2,030,000,000.00     $ 2,030,000,000.00   $ 2,730,000,000