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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
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 447,685 | $ 435,231
Additions | 39,799 | 14,008
Divestitures |  | (1,554)
Goodwill | 487,484 | 447,685
Financial Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 267,485 | 268,630
Additions | 3,845 | 409
Divestitures |  | (1,554)
Goodwill | 271,330 | 267,485
Benefits and Insurance Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 178,534 | 164,935
Additions | 35,954 | 13,599
Goodwill | 214,488 | 178,534
National Practices [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 1,666 | 1,666
Goodwill | $ 1,666 | $ 1,666

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