Segment Information - Components of Segment Revenues and Adjusted EBITDA (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Segment Revenues	$ 546,413	$ 328,243	$ 233,854
Segment Adjusted EBITDA	77,642	54,476	31,495
Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	546,413	328,243	233,854
Segment Adjusted EBITDA	107,724	72,532	45,136
Assessment, Permitting and Response | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	261,865	98,521	21,071
Segment Adjusted EBITDA	57,128	24,208	7,572
Measurement and Analysis | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	153,208	151,557	135,531
Segment Adjusted EBITDA	31,270	39,386	27,828
Remediation and Reuse | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	131,340	78,165	77,252
Segment Adjusted EBITDA	19,326	8,938	9,736
Corporate and Other
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	$ (30,082)	$ (18,056)	$ (13,641)