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Debt Obligations - Current Maturities of Long-Term Debt and Short-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Short-term debt $ 0 $ 2,735
Current maturities of long-term debt 1,220 4,828
Current maturities of long-term debt and short-term debt $ 1,220 $ 7,563