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Debt - Net Maturities and/or Curtailment Obligations of All Borrowings (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 $ 4,935  
2020 4,802  
2021 4,375  
2022 1,419  
2023 and thereafter 32  
Total $ 15,563 $ 18,930