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Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Apr. 01, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Acquisitions              
Revenues   $ 650,302 $ 535,043 $ 1,188,775 $ 999,984    
Consideration transferred:              
Total consideration transferred       2,600      
Recognized amounts of identifiable assets acquired and liabilities assumed:              
Goodwill   332,562   332,562   $ 235,182 $ 200,584
Walker              
Acquisitions              
Revenues   $ 92,600   $ 92,600      
Consideration transferred:              
Cash paid at closing $ 178,000            
Advance to former owners 20,500            
Working capital adjustment (7,594)            
Notes issued to former owners 25,000            
Tax equalization payment 202            
Estimated fair value of contingent earn-out payments 19,500            
Total consideration transferred 235,608            
Recognized amounts of identifiable assets acquired and liabilities assumed:              
Cash and cash equivalents 4,312            
Billed and unbilled accounts receivable 92,309            
Other current assets 8,225            
Other long-term assets 53            
Property and equipment 4,970            
Goodwill 96,801            
Identifiable intangible assets 90,200            
Lease right-of-use asset (10,495)            
Accounts payable (19,682)            
Accrued compensation and benefits (974)            
Billings in excess of costs and estimated earnings (31,553)            
Other current liabilities (11,278)            
Long-term lease liabilities (8,270)            
Total assets acquired and liabilities assumed $ 235,608            
Cash flow discount rate 10.20%            
Walker | Minimum              
Recognized amounts of identifiable assets acquired and liabilities assumed:              
Cash flow discount rate 8.50%            
Walker | Maximum              
Recognized amounts of identifiable assets acquired and liabilities assumed:              
Cash flow discount rate 11.50%