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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
May 31, 2022
Dec. 31, 2021
Jul. 06, 2021
Dec. 31, 2020
Nov. 19, 2020
Business Acquisition [Line Items]            
Contract assets $ 634,033   $ 579,216      
Goodwill 1,661,850   1,412,690   $ 1,261,978  
Investments in and advances to unconsolidated joint ventures 107,425   110,688      
Contract liabilities $ (213,064)   $ (171,671)      
Xator Corporation            
Business Acquisition [Line Items]            
Cash and cash equivalents   $ 8,935        
Accounts receivable   7,393        
Contract assets   25,397        
Prepaid expenses and other current assets   3,615        
Property and equipment   1,699        
Right of use assets, operating leases   7,517        
Goodwill   253,190        
Investments in and advances to unconsolidated joint ventures   698        
Intangible assets   123,500        
Other noncurrent assets   9,156        
Accounts payable   (6,626)        
Accrued expenses and other current liabilities   (31,119)        
Contract liabilities   (2,080)        
Short-term lease liabilities, operating leases   (2,371)        
Long-term lease liabilities, operating leases   (5,146)        
Other long-term liabilities   (9,156)        
Net assets acquired   $ 384,602        
BlackHorse Solutions, Inc.            
Business Acquisition [Line Items]            
Cash and cash equivalents       $ 15,428    
Accounts receivable       3,351    
Contract assets       5,979    
Prepaid expenses and other current assets       937    
Property and equipment       2,239    
Right of use assets, operating leases       6,157    
Goodwill       143,086    
Intangible assets       65,000    
Accounts payable       (2,326)    
Accrued expenses and other current liabilities       (17,190)    
Contract liabilities       (320)    
Short-term lease liabilities, operating leases       (1,011)    
Long-term lease liabilities, operating leases       (5,146)    
Deferred tax liabilities       (10,916)    
Other long-term liabilities       (235)    
Net assets acquired       $ 205,033    
Braxton Science & Technology Group            
Business Acquisition [Line Items]            
Cash and cash equivalents           $ 7,006
Accounts receivable           18,163
Contract assets           8,350
Prepaid expenses and other current assets           3,036
Property and equipment           5,114
Right of use assets, operating leases           10,788
Goodwill           212,185
Intangible assets           74,950
Accounts payable           (7,464)
Accrued expenses and other current liabilities           (9,845)
Contract liabilities           (300)
Short-term lease liabilities, operating leases           (1,915)
Long-term lease liabilities, operating leases           (8,873)
Deferred tax liabilities           (1,694)
Net assets acquired           $ 309,501