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Goodwill - Summary of Changes in Carrying Value of Goodwill by Reporting Segment (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
USD ($)
Goodwill [Line Items]  
Beginning Balance $ 1,661,850
Acquisitions 29,752
Foreign Exchange 1,123
Ending Balance 1,692,725
Federal Solutions  
Goodwill [Line Items]  
Beginning Balance 1,591,563
Acquisitions 4,744
Foreign Exchange 0
Ending Balance 1,596,307
Critical Infrastructure  
Goodwill [Line Items]  
Beginning Balance 70,287
Acquisitions 25,008
Foreign Exchange 1,123
Ending Balance $ 96,418