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Goodwill and Intangible Assets - Schedule of Amounts Related to Goodwill (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
USD ($)
Goodwill [Line Items]  
Beginning balance $ 467,789
Acquisitions measurement period adjustments, net of foreign currency translation 1,236
Ending balance 469,025
Assessment, Permitting and Response  
Goodwill [Line Items]  
Beginning balance 205,231
Acquisitions measurement period adjustments, net of foreign currency translation 1,096
Ending balance 206,327
Measurement and Analysis  
Goodwill [Line Items]  
Beginning balance 118,860
Acquisitions measurement period adjustments, net of foreign currency translation 220
Ending balance 119,080
Remediation and Reuse Segment  
Goodwill [Line Items]  
Beginning balance 143,698
Acquisitions measurement period adjustments, net of foreign currency translation (80)
Ending balance $ 143,618