Business Acquisitions - Summary of Elements of Purchase Price of Acquisitions (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Apr. 30, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Cash		$ 28,562
Common Stock		3,363
Other Purchase Price Components		1,670
Contingent Consideration		5,388
Total Purchase Price		38,983
CTEH
Business Acquisition [Line Items]
Cash	$ 175,000
Common Stock	25,000
Other Purchase Price Component	(2,884)
Contingent Consideration Current	34,451
Contingent Consideration Long Term	10,543
Total Purchase Price	$ 242,110
Golden
Business Acquisition [Line Items]
Cash		1,500
Contingent Consideration		477
Total Purchase Price		1,977
TES
Business Acquisition [Line Items]
Cash		2,359
Common Stock		322
Other Purchase Price Components		25
Contingent Consideration		4,911
Total Purchase Price		7,617
TESUS
Business Acquisition [Line Items]
Cash		18,683
Common Stock		3,041
Other Purchase Price Components		1,495
Total Purchase Price		23,219
AWS
Business Acquisition [Line Items]
Cash		6,020
Other Purchase Price Components		150
Total Purchase Price		$ 6,170