Segment Information - Components of Segment Revenues and Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Segment Revenues	$ 134,680	$ 133,817
Segment Adjusted EBITDA	16,451	16,800
Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	134,680	133,817
Segment Adjusted EBITDA	23,938	23,145
Assessment, Permitting and Response | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	45,600	75,262
Segment Adjusted EBITDA	9,623	15,804
Measurement and Analysis | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	39,761	33,440
Segment Adjusted EBITDA	6,322	4,860
Remediation and Reuse | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	49,319	25,115
Segment Adjusted EBITDA	7,993	2,481
Corporate and Other
Segment Reporting Information [Line Items]
Segment Adjusted EBITDA	$ (7,487)	$ (6,345)