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Debt - Net Maturities and/or Curtailment Obligations of All Borrowings (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2019 $ 0  
2020 4,984  
2021 0  
2022 1,367  
2023 and thereafter 32  
Total $ 6,383 $ 6,420