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Segment Information - Components of Segment Revenues and Adjusted EBITDA (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |
Segment Revenues | $ 133,817 | $ 61,031
Segment Adjusted EBITDA | 16,800 | 5,553
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Segment Revenues | 133,817 | 61,031
Segment Adjusted EBITDA | 23,145 | 10,928
Assessment, Permitting and Response | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Segment Revenues | 75,262 | 4,530
Segment Adjusted EBITDA | 15,804 | 1,442
Measurement and Analysis | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Segment Revenues | 33,440 | 36,440
Segment Adjusted EBITDA | 4,860 | 7,379
Remediation and Reuse | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Segment Revenues | 25,115 | 20,061
Segment Adjusted EBITDA | 2,481 | 2,107
Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
Segment Adjusted EBITDA | $ (6,345) | $ (5,375)

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