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Deferred income Taxes - Schedule of Non-capital and Farm Losses Expire (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses $ 85,254
Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 385
United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 84,869
2021 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 8,402
2021 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 8,402
2022 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 5,043
2022 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 5,043
2023 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 5,117
2023 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 5,117
2024 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4,015
2024 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4,015
2025 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 8,757
2025 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 8,757
2027 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 25
2027 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 25
2028 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4
2028 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4
2029 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 89
2029 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 25
2029 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 64
2030 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 7
2030 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 7
2031 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 992
2031 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4
2031 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 988
2032 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 14,899
2032 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4
2032 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 14,895
2033 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4
2033 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4
2034 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 11,669
2034 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4
2034 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 11,665
2035 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 7,553
2035 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 108
2035 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 7,445
2036 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 3,681
2036 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 98
2036 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 3,583
2037 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 5,668
2037 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 98
2037 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 5,570
2038 [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 9,329
2038 [member] | Canada [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses 4
2038 [member] | United States [member]  
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]  
Unused Non Capital And Farm Losses $ 9,325