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Revenue - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]    
Unbilled service fees $ 170,800 $ 116,400
Unbilled outside vendor costs, billable to clients 97,590 93,077
Advance billings 334,933 $ 337,034
Increase (Decrease) in Advance Billings (2,100)  
Contract with Customer, Liability, Revenue Recognized 234,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation, amount $ 90,800  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation, percent 61.00%  
Expected timing of satisfaction 9 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 33.00%  
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 6.00%  
Expected timing of satisfaction 1 year