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Debt Obligations - Current Maturities of Long-Term Debt and Short-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Short-term debt $ 12,922 $ 0
Current maturities of long-term debt 2,577 1,220
Current maturities of long-term debt and short-term debt $ 15,499 $ 1,220