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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 474,095 | $ 447,685
Intangible assets: |  |
Total intangible assets | 173,654 | 154,683
Total goodwill and intangibles assets | 647,749 | 602,368
Accumulated amortization: |  |
Total accumulated amortization | (74,727) | (66,715)
Goodwill and other intangible assets, net | 573,022 | 535,653
Client Lists [Member] |  |
Intangible assets: |  |
Total intangible assets | 165,882 | 147,706
Accumulated amortization: |  |
Total accumulated amortization | (72,505) | (65,037)
Other Intangible Assets [Member] |  |
Intangible assets: |  |
Total intangible assets | 7,772 | 6,977
Accumulated amortization: |  |
Total accumulated amortization | $ (2,222) | $ (1,678)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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