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Other assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Miscellaneous non-current assets [abstract]    
Prepaid loan costs $ 749 $ 1,272
Prepaid forestry fees 3,175 3,628
Long-term value added tax and other taxes recoverable 6,668 5,385
Other assets $ 10,592 $ 10,285