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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

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