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Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 30, 2021
Jul. 06, 2021
Nov. 19, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Business Acquisition [Line Items]                
Amortization of intangible assets       $ 27,000 $ 20,900 $ 76,100 $ 65,700  
Revenues       956,050 $ 1,004,236 2,710,103 $ 2,954,688  
Goodwill       1,411,465   1,411,465   $ 1,261,978
BlackHorse Solutions, Inc.                
Business Acquisition [Line Items]                
Percentage of ownership interest acquired   100.00%            
Cash paid to acquire   $ 205,000            
Amortization of intangible assets       2,600        
Goodwill deductible for tax purposes   10,600            
Revenues       16,700        
Goodwill   $ 142,948            
Echo Ridge LLC                
Business Acquisition [Line Items]                
Percentage of ownership interest acquired 100.00%              
Cash paid to acquire $ 9,000              
Goodwill $ 7,200              
Braxton Science & Technology Group                
Business Acquisition [Line Items]                
Percentage of ownership interest acquired     100.00%          
Cash paid to acquire     $ 309,500          
Amortization of intangible assets       4,000   12,100    
Goodwill deductible for tax purposes     196,300          
Revenues       34,000   94,300    
Goodwill     $ 212,185          
Selling, General and Administrative Expense | BlackHorse Solutions, Inc.                
Business Acquisition [Line Items]                
Acquisition related expenses       3,000        
Selling, General and Administrative Expense | Echo Ridge LLC                
Business Acquisition [Line Items]                
Acquisition related expenses       $ 300        
Selling, General and Administrative Expense | Braxton Science & Technology Group                
Business Acquisition [Line Items]                
Acquisition related expenses           $ 600