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Business Combinations - Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended
Mar. 01, 2020
USD ($)
Mar. 01, 2020
GBP (£)
Jan. 01, 2020
USD ($)
Jan. 01, 2020
GBP (£)
Mar. 31, 2020
USD ($)
Mar. 01, 2020
GBP (£)
Jan. 01, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]                
Fair value of future consideration payments         $ 11,700      
Goodwill         789,807     $ 774,534
HCL                
Business Acquisition [Line Items]                
Ownership interest acquired 100.00%         100.00%    
Acquisition price $ 20,400 £ 15.9            
Payments to acquire business 14,300 £ 11.2            
Maximum contingent purchase price payments 6,100         £ 4.7    
Fair value of future consideration payments         5,900      
Revenue         2,600      
Net income         $ 300      
Intangible assets 27,600              
Goodwill 19,100              
HGPE                
Business Acquisition [Line Items]                
Acquisition-date fair value of previous equity interest 34,500              
Gain as a result of remeasuring prior equity interest $ 7,500              
MEPC                
Business Acquisition [Line Items]                
Acquisition price     $ 11,400 £ 8.6        
Payments to acquire business     6,000 £ 4.5        
Maximum contingent purchase price payments     5,400       £ 4.1  
Intangible assets     7,800          
Goodwill     $ 4,200