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Income taxes - Income (Loss) Before Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items] |  |
Income/(loss) before taxes | $ 555,067 | $ 132,461
Canada |  |
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items] |  |
Income/(loss) before taxes | 351,908 | (109,537)
U.S. |  |
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items] |  |
Income/(loss) before taxes | $ 203,159 | $ 241,998

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: 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)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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