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Goodwill and Intangible Assets - Schedule of intangible assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward]    
Gross Carrying Value $ 2,605,840 $ 2,557,677
Accumulated Amortization 1,053,044 857,081
Net Carrying Value 1,552,796 1,700,596
Indefinite-lived Intangible Assets [Roll Forward]    
Indefinite-lived Intangible Assets (Excluding Goodwill) 1,480,000 1,480,000
Indefinite Lived Trade Names Accumulated Impairment Charges 580,000 580,000
Indefinite-Lived Trade Names 900,000 900,000
Intangible Assets, Gross (Excluding Goodwill) 4,085,840 4,037,677
Other Intangible Assets Accumulated Amortization 1,053,044 857,081
Intangible Assets Accumulated Amortization 580,000 580,000
Intangible Assets, Net (Including Goodwill) $ 2,452,796 $ 2,600,596
Client relationships [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Weighted Average Useful Life 14 years 14 years
Gross Carrying Value $ 2,455,360 $ 2,408,573
Accumulated Amortization 977,140 798,153
Net Carrying Value $ 1,478,220 $ 1,610,420
Trade names [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Weighted Average Useful Life 8 years 8 years
Gross Carrying Value $ 134,220 $ 132,844
Accumulated Amortization 66,209 52,485
Net Carrying Value $ 68,011 $ 80,359
Developed technology [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Weighted Average Useful Life 5 years 5 years
Gross Carrying Value $ 10,160 $ 10,160
Accumulated Amortization 5,989 3,957
Net Carrying Value $ 4,171 $ 6,203
Covenant not to compete [Member]    
Finite-lived Intangible Assets [Roll Forward]    
Weighted Average Useful Life 5 years 5 years
Gross Carrying Value $ 6,100 $ 6,100
Accumulated Amortization 3,706 2,486
Net Carrying Value $ 2,394 $ 3,614