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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 447,685 | $ 435,231 | $ 384,697
Intangible assets: |  |  |
Total intangible assets | 154,683 | 146,669 |
Total goodwill and intangibles assets | 602,368 | 581,900 |
Accumulated amortization: |  |  |
Total accumulated amortization | (66,715) | (55,438) |
Goodwill and other intangible assets, net | 535,653 | 526,462 |
Client Lists [Member] |  |  |
Intangible assets: |  |  |
Total intangible assets | 147,706 | 140,187 |
Accumulated amortization: |  |  |
Total accumulated amortization | (65,037) | (54,213) |
Other Intangible Assets [Member] |  |  |
Intangible assets: |  |  |
Total intangible assets | 6,977 | 6,482 |
Accumulated amortization: |  |  |
Total accumulated amortization | $ (1,678) | $ (1,225) |

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