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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 |

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