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Changes in Non Cash Working Capital Items - (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Changes In Non Cash Working Capital Items [Abstract]      
Trade receivables $ (3,196) $ 2,301 $ (33)
Inventories 2,997 9,042 (5,435)
Note Receivable 765    
Due from joint ventures 4,363 (3,530)  
Other receivables 199 (448) 1,239
Prepaid expenses and deposits (1,245) (370) (79)
Trade payables (1,665) (1,953) 1,649
Accrued liabilities 6,565 (369) (284)
Other assets, net of other liabilities 4,289 571 (282)
Total $ 13,072 $ 5,244 $ (3,225)