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Goodwill and Other Intangible Assets, Net - Components of Goodwill and Other Intangible Assets, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 588,213 | $ 564,300
Intangible assets: |  |
Total intangible assets | 198,998 | 191,011
Total goodwill and intangibles assets | 787,211 | 755,311
Accumulated amortization: |  |
Total accumulated amortization | (128,769) | (118,302)
Goodwill and other intangible assets, net | 658,442 | 637,009
Client Lists [Member] |  |
Intangible assets: |  |
Total intangible assets | 189,120 | 181,564
Accumulated amortization: |  |
Total accumulated amortization | (122,595) | (112,905)
Other Intangible Assets [Member] |  |
Intangible assets: |  |
Total intangible assets | 9,878 | 9,447
Accumulated amortization: |  |
Total accumulated amortization | $ (6,174) | $ (5,397)

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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/disclosureRef -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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