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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, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 435,231 | $ 384,697
Additions | 14,008 | 52,071
Divestitures | (1,554) | (1,537)
Goodwill | 447,685 | 435,231
Financial Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 268,630 | 260,715
Additions | 409 | 9,452
Divestitures | (1,554) | (1,537)
Goodwill | 267,485 | 268,630
Employee Services [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 164,935 | 122,316
Additions | 13,599 | 42,619
Goodwill | 178,534 | 164,935
National Practices [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | 1,666 | 1,666
Goodwill | $ 1,666 | $ 1,666

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