Acquisitions and Dispositions - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	9 Months Ended	18 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2021	Apr. 06, 2020	Dec. 31, 2019	Jun. 28, 2019
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 889,048	$ 889,048	$ 883,109		$ 725,343
Non-compete agreement	517,146	517,146	516,240
Clean Earth
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets			242,200			$ 261,100
ESOL
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Right-of-use assets, net				$ 56,000
Clean Earth
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	482,647	482,647	483,879		$ 330,230
Measurement Period Adjustments
Measurement period adjustment, intangible assets		(18,900)
Clean Earth | Clean Earth
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash and cash equivalents			3,600			42,800
Trade accounts receivable, net			62,500			63,700
Other current assets			7,300			8,700
Property, plant and equipment			77,000			75,600
Right-of-use assets, net			25,800			14,400
Goodwill			330,600			313,800
Intangible assets			242,200			261,100
Other assets			1,200			4,000
Accounts payable			(23,100)			(23,000)
Other current liabilities			(19,700)			(18,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities			(45,700)			(51,200)
Operating lease liabilities			(19,500)			(11,100)
Other receivables			2,100			800
Acquisition consideration payable			0			(39,200)
Other liabilities			(8,600)			(6,500)
Total identifiable net assets			635,700			$ 635,900
Measurement Period Adjustments
Measurement period adjustment, cash and cash equivalent		(39,200)
Measurement period adjustment, trade accounts receivable, net		(1,200)
Measurement period adjustment, other receivable		1,300
Measurement period adjustment, other current assets		(1,400)
Measurement period adjustment, property, plant and equipment		1,400
Measurement period adjustment, right-of-use assets		11,400
Measurement period adjustment, other assets		(2,800)
Measurement period adjustment, acquisition consideration payable		39,200
Measurement period adjustment, other current liabilities		(1,700)
Measurement period adjustment, accounts payable		100
Measurement period adjustment, deferred income taxes		5,500
Measurement period adjustment, operating lease liabilities		(8,400)
Measurement period adjustment, other liabilities		(2,100)
Measurement period adjustment, intangible assets		(18,900)
Measurement period adjustment, goodwill		16,800
Total identifiable net assets		$ (200)
Clean Earth | ESOL
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash and cash equivalents			400	400
Trade accounts receivable, net			122,600	124,100
Inventory			5,000	5,000
Other current assets			0	700
Property, plant and equipment			101,400	105,300
Right-of-use assets, net			56,000	56,000
Goodwill			153,300	152,000
Intangible assets			161,000	161,000
Other assets			200	200
Accounts payable			(50,100)	(48,600)
Accrued expenses			(19,300)	(17,500)
Current portion of operating lease liabilities			(16,600)	(16,600)
Other current liabilities			(6,600)	(6,400)
Environmental liabilities			(24,400)	(24,400)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities			(17,000)	(15,500)
Operating lease liabilities			(39,400)	(39,400)
Non-compete agreement			2,500	2,500
Total identifiable net assets			426,500	436,300
Business Acquisitions, Purchase Price Allocation			$ 429,000	$ 438,800
Measurement Period Adjustments
Measurement period adjustment, cash and cash equivalent	0
Measurement period adjustment, trade accounts receivable, net	(1,500)
Measurement period adjustment, environmental liabilities	0
Measurement period adjustment, other current assets	(700)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Purchase Price Allocation	(9,800)
Measurement period adjustment, current portion of operating lease liabilities	0
Measurement period adjustment, property, plant and equipment	(3,900)
Measurement period adjustment, right-of-use assets	0
Measurement period adjustment, inventory	0
Measurement period adjustment, other assets	0
Measurement period adjustment, other current liabilities	(200)
Measurement period adjustment, accrued expenses	(1,800)
Measurement period adjustment, accounts payable	1,500
Measurement period adjustment, deferred income taxes	(1,500)
Measurement period adjustment, operating lease liabilities	0
Measurement period adjustment, intangible assets	0
Measurement period adjustment, goodwill	1,300
Total identifiable net assets	$ (9,800)