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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
Debt Disclosure [Abstract]    
Short-term borrowings $ 910,782 $ 1,254,669
Short-term debt, weighted average interest rate 2.70% 2.10%