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Long-Term Debt and Short-Term Borrowings - Short-Term Debt - Additional Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Debt Disclosure [Abstract] |  |
Short-term borrowings | $ 910,782 | $ 1,254,669
Short-term debt, weighted average interest rate | 2.70% | 2.10%

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