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Debt - Maturities of Borrowings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
2018 $ 33,510  
2019 4,080  
2020 124  
2021 0  
2022 and thereafter 1,679  
Total $ 39,393 $ 43,704