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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, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 528,424 | $ 487,484
Additions | 36,089 | 40,940
Divestitures | (213) |
Goodwill | 564,300 | 528,424
Financial Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 306,861 | 271,330
Additions | 22,978 | 35,531
Divestitures | (213) |
Goodwill | 329,626 | 306,861
Benefits and Insurance Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 219,897 | 214,488
Additions | 13,111 | 5,409
Goodwill | 233,008 | 219,897
National Practices [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 1,666 | 1,666
Goodwill | $ 1,666 | $ 1,666

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