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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed on Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
May 31, 2022
Dec. 31, 2021
Jul. 06, 2021
Business Acquisition [Line Items]        
Contract assets $ 642,264   $ 579,216  
Goodwill 1,661,107   1,412,690  
Investments in and advances to unconsolidated joint ventures 99,424   110,688  
Contract liabilities $ (197,749)   $ (171,671)  
Xator Corporation        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 8,935    
Accounts receivable   28,199    
Contract assets   4,591    
Prepaid expenses and other current assets   3,615    
Property and equipment   1,699    
Right of use assets, operating leases   7,517    
Goodwill   252,994    
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   $ 384,406    
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