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Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | $ 1,662,326 | $ 1,520,461
Intangible assets, Accumulated Amortization | 722,021 | 653,626
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | 1,422,569 | 1,295,803
Intangible assets, Accumulated Amortization | 622,440 | 566,884
Trademarks and Trade Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | 176,950 | 161,851
Intangible assets, Accumulated Amortization | 74,551 | 66,494
Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, Gross Amount | 62,807 | 62,807
Intangible assets, Accumulated Amortization | $ 25,030 | $ 20,248

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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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