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Acquisitions - Schedule of Fair Values of Identifiable Assets and Liabilities of Acquisitions (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Consideration:      
Cash $ 17,000    
Liabilities      
Goodwill arising from acquisitions 2,163,339 $ 2,116,696 $ 2,106,367
2020 Acquisitions      
Consideration:      
Cash 68,057    
Holdbacks 5,260    
Fair value of contingent consideration 14,766    
Total consideration 88,083    
Identifiable intangible assets 42,460    
Assets      
Accounts receivable 3,542    
Other assets 2,936    
Property and equipment 321    
Identifiable intangible assets 42,460    
Total assets 49,259    
Liabilities      
Total liabilities 4,569    
Total identifiable net assets 44,690    
Goodwill arising from acquisitions $ 43,393    
2020 Acquisitions | Client relationships [Member]      
Consideration:      
Weighted Average Useful Life 6 years    
Identifiable intangible assets $ 42,460    
Assets      
Identifiable intangible assets $ 42,460    
2019 Acquisitions      
Consideration:      
Cash   10,582  
Holdbacks   915  
Fair value of contingent consideration   2,519  
Total consideration   14,016  
Identifiable intangible assets   10,400  
Assets      
Accounts receivable   6,853  
Other assets   1,390  
Identifiable intangible assets   10,400  
Total assets   18,643  
Liabilities      
Accounts payable   2,138  
Accrued compensation and benefits   2,478  
Deferred revenue   1,258  
Long-term debt   1,009  
Deferred income tax liabilities   2,334  
Noncontrolling interest and other liabilities   2,761  
Total liabilities   11,978  
Total identifiable net assets   6,665  
Goodwill arising from acquisitions   7,351  
2019 Acquisitions | Client relationships [Member]      
Consideration:      
Weighted Average Useful Life 10 years    
Identifiable intangible assets   7,562  
Assets      
Identifiable intangible assets   7,562  
2019 Acquisitions | Trade names [Member]      
Consideration:      
Weighted Average Useful Life 5 years    
Identifiable intangible assets   2,838  
Assets      
Identifiable intangible assets   $ 2,838