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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 526,984 | $ 487,484
Intangible assets: |  |
Total intangible assets | 184,100 | 180,337
Total goodwill and intangibles assets | 711,084 | 667,821
Accumulated amortization: |  |
Total accumulated amortization | (92,238) | (83,420)
Goodwill and other intangible assets, net | 618,846 | 584,401
Client Lists [Member] |  |
Intangible assets: |  |
Total intangible assets | 175,397 | 172,343
Accumulated amortization: |  |
Total accumulated amortization | (88,754) | (80,560)
Other Intangible Assets [Member] |  |
Intangible assets: |  |
Total intangible assets | 8,703 | 7,994
Accumulated amortization: |  |
Total accumulated amortization | $ (3,484) | $ (2,860)

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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 Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + 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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