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v3.3.1.900

Goodwill and Other Intangible Assets, Net - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) Business | Nov. 01, 2015 USD ($) | Dec. 31, 2014 USD ($) Business | Dec. 31, 2013 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Additions to goodwill |  |  | $ 51,900,000 |
Decrease to goodwill resulting from business divestiture | $ 1,554,000 |  | 1,537,000 |
Goodwill | 447,685,000 |  | $ 435,231,000 | $ 384,697,000
Goodwill, Impairment Loss | $ 0 | $ 0 |  |
Finite-Lived Intangible Asset, Useful Life | 7 years 9 months 18 days |  |  |
Minimum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  |
Maximum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  |
Client Lists [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Remaining weighted average amortization period remaining for total intangible assets | 7 years 7 months 6 days |  |  |
Other Intangible Assets [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |  |
Other Intangible Assets [Member] | Minimum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  |
Other Intangible Assets [Member] | Maximum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |  |
Financial Services Practice Group [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of businesses sold | Business | 3 |  | 1 |
Decrease to goodwill resulting from business divestiture | $ 1,600,000 |  | $ 1,500,000 |
Employee Services [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Additions to goodwill | 13,500,000 |  | 42,600,000 |
Goodwill | $ 178,534,000 |  | 164,935,000 | 122,316,000
Financial Services [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Additions to goodwill |  |  | 9,300,000 |
Number of businesses sold | Business | 2 |  |  |
Decrease to goodwill resulting from business divestiture | $ 1,554,000 |  | 1,537,000 |
Goodwill | $ 267,485,000 |  | $ 268,630,000 | $ 260,715,000

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