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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Cash | $ 800 | $ 300 |
Acquired client funds | 6,900 |  |
Goodwill | 588,213 | 564,300 | $ 528,424
Business Acquisitions in 2019 and 2018 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | 826 | 306 |
Accounts receivable, net | 1,843 | 1,958 |
Acquired client funds | 6,878 |  |
Operating lease right-of-use asset, net | 2,789 |  |
Other assets | 99 | 12 |
Identifiable intangible assets | 7,725 | 5,539 |
Operating lease liability - current | (1,013) |  |
Other current liability | (2,245) | (1,753) |
Operating lease liability - noncurrent | (1,776) |  |
Client fund obligations | (6,878) |  |
Total identifiable net assets | 8,248 | 6,062 |
Goodwill | 24,369 | 36,054 |
Aggregate purchase price | $ 32,617 | $ 42,116 |

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