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Software and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 325,331 | $ 321,864
Accumulated Amortization | (136,643) | (130,583)
Net Balance | 188,688 | 191,281
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 308,489 | 305,218
Accumulated Amortization | (122,164) | (116,677)
Net Balance | 186,325 | 188,541
Trademarks and Tradenames [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,842 | 16,646
Accumulated Amortization | (14,479) | (13,906)
Net Balance | $ 2,363 | $ 2,740

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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 before 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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