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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Cash | $ 800 |  |
Acquired client funds | 6,900 |  |
Goodwill | 588,213 | $ 564,300 |
Business Acquisitions in 2019 and 2018 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash | 826 |  | $ 306
Accounts receivable, net | 1,843 |  | 1,920
Acquired client funds | 6,878 |  |
Operating lease right-of-use asset, net | 2,789 |  |
Other assets | 99 |  | 12
Identifiable intangible assets | 7,725 |  | 3,864
Operating lease liability - current | (1,013) |  |
Other current liability | (2,245) |  | (1,717)
Operating lease liability - noncurrent | (1,776) |  |
Client fund obligations | (6,878) |  |
Total identifiable net assets | 8,248 |  | 4,385
Goodwill | 24,369 |  | 32,255
Aggregate purchase price | $ 32,617 |  | $ 36,640

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