Acquisitions and Dispositions - Summary of Changes in Fair Value of Contingent Consideration (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Altek
Contingent Consideration Liability [Roll Forward]
Balance, beginning of period		$ 0	$ 8,420	$ 0
Fair value adjustment			(8,506)	(2,939)
Foreign currency translation			86	(696)
Balance, end of period	$ 0		0	8,420
Recognition of contingent consideration		0		10,097
Measurement period adjustment		0		$ 1,958
Clean Earth
Contingent Consideration Liability [Roll Forward]
Balance, beginning of period	3,100	3,400
Payment	(525)	(2,342)
Fair value adjustment	825	112
Balance, end of period	$ 3,400	$ 1,170	$ 3,400