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Income taxes - Summary of Factors Affecting Income Tax Expense (Recovery) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Major components of tax expense (income) [abstract] |  |
Earnings (loss) from continuing operations before income tax | $ (466,129) | $ 792
Canadian statutory tax rate | 27.00% | 26.00%
Tax expense (recovery) on net income at Canadian statutory tax rate | $ (125,855) | $ 206
Items that cause an increase (decrease) in income tax expense: |  |
Foreign income subject to different income tax rates than Canada | (17,498) | (11,792)
Reduction in Greek income tax rate | (24,968) | 0
Non-tax effected operating losses | 12,716 | 9,691
Non-deductible expenses and other items | 14,923 | 10,002
Foreign exchange and other translation adjustments | 36,837 | 6,289
Future and current withholding tax on foreign income dividends | 20,000 | 5,297
Other | (2,653) | (310)
Income tax expense (recovery) | $ (86,498) | $ 19,383

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