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Related Party Transactions - Narrative (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Mar. 31, 2023
renewal_option
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Agreement
renewal_option
building
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Related Party Transaction [Line Items]            
Total revenue $ 492,499   $ 383,744 $ 1,387,441 $ 1,065,898  
Advanced billings 518,755     518,755   $ 462,729
Accounts receivable and unbilled, net 292,773     292,773   253,404
Other current liabilities 35,955     35,955   47,547
Operating lease cost recognized 7,002   6,482 20,637 19,357  
Operating lease right-of-use assets 144,147     144,147   139,068
Current portion of lease liability 20,278     20,278   19,272
Long-term portion of lease liabilities 143,039     143,039   138,867
Accounts payable 29,023     29,023   33,069
Related Party            
Related Party Transaction [Line Items]            
Total revenue 15,500   9,800 44,600 40,300  
Advanced billings 13,400     13,400   8,800
Accounts receivable and unbilled, net 2,200     2,200   7,700
Other current liabilities           12,500
Operating lease right-of-use assets 84,592     84,592   86,356
Current portion of lease liability 5,592     5,592   5,409
Long-term portion of lease liabilities 92,049     92,049   93,393
Accounts payable 3,100     3,100   300
Employee Loans | Related Party            
Related Party Transaction [Line Items]            
Prepaid expenses, other current assets, and other assets 300     300   300
Service Agreement | Related Party | LIB            
Related Party Transaction [Line Items]            
Advanced billings 10,600     10,600   7,400
Accounts receivable and unbilled, net 700     700   5,500
Other current liabilities           12,500
Service Agreement | Related Party | CinRx Pharma and Subsidiaries            
Related Party Transaction [Line Items]            
Advanced billings 2,800     2,800   1,400
Accounts receivable and unbilled, net 1,500     1,500   2,200
Service Agreement | Related Party | The Summit            
Related Party Transaction [Line Items]            
Expenses (less than for the three months ended June 30, 2022) 100   100 300 200  
Service Agreement | Related Party | Total revenue | LIB            
Related Party Transaction [Line Items]            
Total revenue 10,100   9,500 33,100 26,600  
Service Agreement | Related Party | Total revenue | CinRx Pharma and Subsidiaries            
Related Party Transaction [Line Items]            
Total revenue 5,300   500 11,400 13,800  
Leased Real Estate | Chief Executive Officer            
Related Party Transaction [Line Items]            
Term of lease   10 years        
Number of lease renewal, 10-year option | renewal_option   1        
Lease term upon renewal   10 years        
Operating lease right-of-use assets 19,800     19,800   18,200
Current portion of lease liability 1,400     1,400   1,500
Long-term portion of lease liabilities 18,500     18,500   16,700
Leased Real Estate | Chief Executive Officer | Direct Costs and Selling, General And Administrative            
Related Party Transaction [Line Items]            
Operating lease cost recognized $ 700   600 $ 2,000 1,700  
Leased Real Estate | Chief Executive Officer And Immediate Family | Office Space            
Related Party Transaction [Line Items]            
Number of lease renewal, 10-year option | renewal_option       2    
Lease term upon renewal 10 years     10 years    
Operating lease right-of-use assets $ 52,300     $ 52,300   53,500
Current portion of lease liability 1,200     1,200   1,100
Long-term portion of lease liabilities $ 63,900     $ 63,900   64,800
Leased Real Estate | Chief Executive Officer And Immediate Family | Building            
Related Party Transaction [Line Items]            
Number of lease renewal, 10-year option | renewal_option       1    
Lease term upon renewal 10 years     10 years    
Operating lease right-of-use assets $ 12,600     $ 12,600   14,600
Current portion of lease liability 2,900     2,900   2,800
Long-term portion of lease liabilities 9,700     $ 9,700   11,900
Number of lease agreements | Agreement       2    
Number of buildings | building       2    
Leased Real Estate | Chief Executive Officer And Immediate Family | Direct Costs and Selling, General And Administrative | Office Space            
Related Party Transaction [Line Items]            
Operating lease cost recognized 1,500   1,500 $ 4,300 4,300  
Leased Real Estate | Chief Executive Officer And Immediate Family | Direct Costs and Selling, General And Administrative | Building            
Related Party Transaction [Line Items]            
Operating lease cost recognized 900   900 2,700 2,700  
Travel Services | Related Party            
Related Party Transaction [Line Items]            
Accounts payable 300     300   $ 300
Travel Services | Chief Executive Officer            
Related Party Transaction [Line Items]            
Travel expenses $ 700   $ 600 $ 1,500 $ 1,600