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Goodwill and Other Intangible Assets, Net - Changes in Carrying Amount of Goodwill by Operating Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Beginning balance, Goodwill | $ 564,300 | $ 528,424
Additions | 24,369 | 36,089
Divestitures | (456) | (213)
Ending balance, Goodwill | 588,213 | 564,300
Financial Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Beginning balance, Goodwill | 329,626 | 306,861
Additions | 5,077 | 22,978
Divestitures | (456) | (213)
Ending balance, Goodwill | 334,247 | 329,626
Benefits and Insurance Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Beginning balance, Goodwill | 233,008 | 219,897
Additions | 19,292 | 13,111
Ending balance, Goodwill | 252,300 | 233,008
National Practices [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Beginning balance, Goodwill | 1,666 | 1,666
Ending balance, Goodwill | $ 1,666 | $ 1,666

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