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Software and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 314,339 | $ 321,864
Accumulated Amortization | (146,212) | (130,583)
Net Balance | 168,127 | 191,281
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 297,991 | 305,218
Accumulated Amortization | (131,187) | (116,677)
Net Balance | 166,804 | 188,541
Trademarks and Tradenames [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 16,348 | 16,646
Accumulated Amortization | (15,025) | (13,906)
Net Balance | $ 1,323 | $ 2,740

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