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Income taxes - Income Tax Expense (Recovery) Attributable to Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Tax Expenses [Line Items] |  |
Income tax expenses, current | $ 4,888 | $ 16,431
Deferred Income Tax Expense (Benefit) | 59,695 | 53,686
Income tax expense | 64,583 | 70,117
Canada |  |
Income Tax Expenses [Line Items] |  |
Income tax expenses, current | 6,336 | 6,695
Deferred Income Tax Expense (Benefit) | 61,440 | 17,607
Income tax expense | 67,776 | 24,302
United States |  |
Income Tax Expenses [Line Items] |  |
Income tax expenses, current | (1,448) | 9,736
Deferred Income Tax Expense (Benefit) | (1,745) | 36,079
Income tax expense | $ (3,193) | $ 45,815

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.2) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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