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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, 2019
Jul. 31, 2019
Jan. 07, 2019
Dec. 31, 2018
May 31, 2018
Business Acquisition [Line Items]          
Contract assets $ 583,670     $ 515,319  
Goodwill 1,050,077     736,938  
Contract liabilities (231,032)     $ (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 $ 243,500       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     (1,469)    
Deferred tax liabilities     (904)    
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   5,467      
Property and equipment   1,205      
Right of use assets, operating leases   5,228      
Goodwill   128,387      
Intangible assets   72,900      
Accounts payable   (1,567)      
Accrued expenses and other current liabilities   (3,771)      
Short-term lease liabilities, operating leases   (545)      
Long-term lease liabilities, operating leases   (4,683)      
Net assets acquired   $ 214,133