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Description of Business and Summary of Significant Accounting Policies (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
optionToExtend
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 26, 2020
Aug. 20, 2018
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Number of reportable business segments | segment 5        
Advertising costs $ 15,200 $ 18,600 $ 15,500    
Billed receivables (513,459) (482,333)      
Unbilled receivables (236,285) (246,205)      
Allowance for expected credit losses $ (38,387) $ (35,166)      
Forgivable loans, forgiveness period, minimum 1 year        
Forgivable loans, forgiveness period, maximum 10 years        
Definite-lived intangible assets amortization period 13 years        
Number of option to extend | optionToExtend 1        
Lessee renewal term       5 years  
Revision of Prior Period, Reclassification, Adjustment [Member]          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Billed receivables $ 58,300        
Unbilled receivables 172,100        
Allowance for expected credit losses $ 230,300        
Minimum          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Definite-lived intangible assets amortization period 2 years        
Maximum          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Definite-lived intangible assets amortization period 15 years        
Lessee renewal term 7 years        
Furniture, Equipment, And Internal-Use Software | Minimum          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Estimated useful of furniture, equipment and internal use software (in years) 1 year        
Furniture, Equipment, And Internal-Use Software | Maximum          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Estimated useful of furniture, equipment and internal use software (in years) 7 years        
Software and Software Development Costs          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Estimated useful of furniture, equipment and internal use software (in years) 3 years        
Geographic Concentration Risk | Consolidated Revenues | Non U.S          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Revenue from the work of professionals 37.00%        
Senior Notes | Convertible Note Due 2023          
Description Of Business And Summary Of Significant Accounting Policies [Line Items]          
Interest rate (as a percent) 2.00%       2.00%