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Segment Information - Components of Segment Revenues, Segment Expenses and Segment Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Segment Revenues	$ 224,888	$ 178,687	$ 637,265	$ 507,337
Segment Adjusted EBITDA	47,131	36,213	133,286	97,915
Assessment, Permitting and Response | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	91,081	52,019	248,144	164,043
Segment Expenses	70,645	40,831	189,581	123,955
Segment Adjusted EBITDA	20,436	11,188	58,563	40,088
Measurement and Analysis | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	62,958	58,583	184,783	158,889
Segment Expenses	45,675	45,213	135,429	126,656
Segment Adjusted EBITDA	17,283	13,370	49,354	32,233
Remediation and Reuse | Operating Segments
Segment Reporting Information [Line Items]
Segment Revenues	70,849	68,085	204,338	184,405
Segment Expenses	61,437	56,430	178,969	158,811
Segment Adjusted EBITDA	$ 9,412	$ 11,655	$ 25,369	$ 25,594

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