Acquisitions and Dispositions - Summary of Intangible Assets and Amortization Periods (Details) - USD ($) $ in Thousands		9 Months Ended	18 Months Ended
	Jun. 28, 2019	Dec. 31, 2020	Dec. 31, 2020	Apr. 06, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Non-compete agreement		$ 523,048	$ 523,048		$ 412,657
Permits
Acquired Finite-Lived Intangible Assets [Line Items]
Non-compete agreement		308,705	308,705		170,322
Air rights
Acquired Finite-Lived Intangible Assets [Line Items]
Non-compete agreement		26,139	26,139		26,139
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Non-compete agreement		31,949	31,949		$ 31,719
Clean Earth
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Permits			(6,000)
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Customer Relationships			(12,900)
Measurement Period Adjustments			(18,900)
Clean Earth
Acquired Finite-Lived Intangible Assets [Line Items]
Total identifiable intangible assets	$ 261,100	242,200	242,200
Clean Earth | Permits
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period	18 years
Total identifiable intangible assets	$ 176,100	170,100	170,100
Clean Earth | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period	8 years
Total identifiable intangible assets	$ 33,400	20,500	20,500
Clean Earth | Air rights
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period	27 years
Total identifiable intangible assets	$ 25,600	25,600	25,600
Clean Earth | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period	12 years
Total identifiable intangible assets	$ 26,000	26,000	26,000
Clean Earth | Clean Earth
Acquired Finite-Lived Intangible Assets [Line Items]
Total identifiable intangible assets	$ 261,100	$ 242,200	242,200
Measurement Period Adjustments			(18,900)
ESOL | Permits
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period		22 years
Total identifiable intangible assets		$ 138,000	138,000	$ 138,000
ESOL | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period		10 years
Total identifiable intangible assets		$ 23,000	23,000	23,000
ESOL | Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period		4 years
ESOL | Clean Earth
Acquired Finite-Lived Intangible Assets [Line Items]
Total identifiable intangible assets		$ 161,000	161,000	161,000
Measurement Period Adjustments		0
Non-compete agreement		2,500	2,500	2,500
Business Combination, Recognized Identifiable Intangible Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles, Including Non-Compete		163,500	$ 163,500	$ 163,500
ESOL | Clean Earth | Noncompete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Permits		0
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Customer Relationships		0
Measurement Period Adjustments		0
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments, Intangibles, Including Non-Compete		$ 0