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Revenue - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]    
Unbilled service fees $ 187,400 $ 116,400
Unbilled outside vendor costs, billable to clients 128,903 93,077
Advance billings 335,600 $ 337,034
Increase (Decrease) in Advance Billings (1,400)  
Contract with Customer, Liability, Revenue Recognized 300,200  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation, amount $ 122,500  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation, percent 30.00%  
Expected timing of satisfaction 3 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation, percent 57.00%  
Expected timing of satisfaction 1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation, percent 13.00%  
Expected timing of satisfaction 1 year