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Changes In Non-Cash Working Capital Items - (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Changes In Non Cash Working Capital Items [Abstract]      
Trade receivables $ 2,301 $ (33) $ (1,059)
Inventories 9,042 (5,435) (895)
Due from joint ventures (3,530)    
Other receivables (448) 1,239 (1,062)
Prepaid expenses and deposits (370) (79) (134)
Trade payables (1,953) 1,649 241
Accrued liabilities (369) (284) 207
Other assets, net of other liabilities 571 (206) (817)
Total $ 5,244 $ (3,149) $ (3,519)