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Long-Term Debt and Short-Term Borrowings - Short-Term Debt - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Short-term borrowings $ 1,328,761 $ 910,782
Short-term debt, weighted average interest rate 3.80% 2.70%