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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