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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Other assets $ 4,935 $ 2,536
Long-term debt 897 1,040
Tax losses: Non-capital and farm losses 14,336 11,553
Provisions: Debt and unit issuance costs 1,355 800
Joint venture shares   1,154
Tax losses: Valuation allowance (35) (31)
Total deferred tax assets 21,488 17,052
Total deferred tax assets 21,488 17,052
Deferred tax liabilities:    
Joint venture shares (2,651) (2,593)
Cash adjustment (7,604)  
Property, plant and equipment (15,980) (8,333)
Total deferred tax liabilities (26,235) (10,926)
Net tax assets   $ 6,126
Net tax liabilities $ (4,747)