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Business Combinations - Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended 4 Months Ended
Mar. 01, 2020
USD ($)
Mar. 01, 2020
GBP (£)
Jan. 01, 2020
USD ($)
Jan. 01, 2020
GBP (£)
Jun. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 01, 2020
GBP (£)
Jan. 01, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]                  
Goodwill         $ 786,999 $ 786,999     $ 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 4,500           £ 3.5    
Revenue         8,700 11,300      
Net income         $ 1,800 $ 2,100      
Intangible assets recorded in connection with acquisition 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     $ 13,100 £ 9.9          
Payments to acquire business     5,900 £ 4.4          
Maximum contingent purchase price payments     7,200         £ 5.5  
Intangible assets recorded in connection with acquisition     7,300            
Goodwill     $ 1,600