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BUSINESS COMBINATIONS - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Oct. 04, 2021
Business Acquisition [Line Items]      
Goodwill $ 1,087,784 $ 1,070,442  
GCA Corporation      
Business Acquisition [Line Items]      
Cash and cash equivalents 228,877    
Investment securities 515    
Accounts receivable 56,080    
Unbilled work in progress 4,672    
Deferred income taxes 1,876    
Property and equipment 8,727    
Operating lease right-of-use assets 27,383    
Other assets 20,506    
Total intangible assets acquired 74,300    
Total assets 422,936    
Accrued salaries and bonuses 152,409    
Accounts payable and accrued expenses 22,722    
Payable to affiliates 15    
Deferred income 78    
Deferred income taxes 0    
Income taxes payable 2,290    
Operating lease liabilities 27,527    
Other liabilities 22,647    
Total liabilities 227,688    
Net identifiable assets acquired 195,248    
Goodwill 394,321   $ 394,300
Total GCA equity value $ 589,569    
Weighted-Average Amortization Period 1 year 3 months 18 days    
GCA Corporation | Backlog      
Business Acquisition [Line Items]      
Total intangible assets acquired $ 42,000    
Weighted-Average Amortization Period 1 year 2 months 12 days    
GCA Corporation | Trade name      
Business Acquisition [Line Items]      
Total intangible assets acquired $ 17,100    
Weighted-Average Amortization Period 2 years    
GCA Corporation | Customer relationships      
Business Acquisition [Line Items]      
Total intangible assets acquired $ 15,200    
Weighted-Average Amortization Period 1 year