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Long-Term Debt and Short-Term Borrowings - Additional Information (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Debt Disclosure [Abstract]  
Future annual aggregate maturities, 2017 $ 1,254,680
Future annual aggregate maturities, 2018 0
Future annual aggregate maturities, 2019 139,123
Future annual aggregate maturities, 2020 525,005
Future annual aggregate maturities, 2021 29,250
Future annual aggregate maturities, thereafter $ 1,883,500