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Debt - Maturities and/or Curtailment Obligations of All Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2018 $ 29,391  
2019 8,266  
2020 128  
2021 0  
2022 and thereafter 1,671  
Total $ 39,456 $ 39,393