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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
Dec. 31, 2019
Jul. 31, 2019
Jan. 07, 2019
Dec. 31, 2018
May 31, 2018
Dec. 29, 2017
Business Acquisition [Line Items]            
Contract assets $ 575,089     $ 515,319    
Goodwill 1,047,425     736,938   $ 496,786
Contract liabilities $ (230,681)     $ (208,576)    
Polaris Alpha            
Business Acquisition [Line Items]            
Cash and cash equivalents         $ 7,914  
Accounts receivable         29,688  
Contract assets         35,229  
Prepaid expenses and other current assets         9,295  
Property and equipment         9,024  
Goodwill         243,471  
Intangible assets         199,520  
Other noncurrent assets         2,203  
Accounts payable         (13,942)  
Accrued expenses and other current liabilities         (26,419)  
Contract liabilities         (3,529)  
Deferred tax liabilities         (2,231)  
Other long-term liabilities         (1,146)  
Net assets acquired         $ 489,077  
OGSystems            
Business Acquisition [Line Items]            
Cash and cash equivalents     $ 5,772      
Accounts receivable     9,904      
Contract assets     9,747      
Prepaid expenses and other current assets     4,307      
Property and equipment     4,085      
Right of use assets, operating leases     8,826      
Goodwill     183,540      
Intangible assets     92,300      
Other noncurrent assets     10      
Accounts payable     (5,450)      
Accrued expenses and other current liabilities     (7,147)      
Contract liabilities     (1,300)      
Short-term lease liabilities, operating leases     (805)      
Income tax payable     (1,178)      
Deferred tax liabilities     (1,195)      
Long-term lease liabilities, operating leases     (8,021)      
Other long-term liabilities     (1,015)      
Net assets acquired     $ 292,380      
QRC Technologies            
Business Acquisition [Line Items]            
Cash and cash equivalents   $ 5,925        
Accounts receivable   5,587        
Prepaid expenses and other current assets   5,727        
Property and equipment   1,205        
Right of use assets, operating leases   5,228        
Goodwill   125,091        
Intangible assets   76,200        
Accounts payable   (1,567)        
Accrued expenses and other current liabilities   (4,025)        
Short-term lease liabilities, operating leases   (545)        
Long-term lease liabilities, operating leases   (4,683)        
Net assets acquired   $ 214,143