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Goodwill - Summary of Changes in Carrying Value of Goodwill by Reporting Segment (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2022
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 1,412,690
Acquisitions 252,250
Foreign Exchange (3,833)
Ending Balance 1,661,107
Federal Solutions  
Goodwill [Line Items]  
Beginning Balance 1,339,117
Acquisitions 252,250
Ending Balance 1,591,367
Critical Infrastructure  
Goodwill [Line Items]  
Beginning Balance 73,573
Foreign Exchange (3,833)
Ending Balance $ 69,740