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Share capital - Summary of Share Capital (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of classes of share capital [line items] |  |
Shares issued upon exercise of share options, for cash (in shares) |  | 48,529
Shares issued for acquisition of Integra (in shares) |  | 15,436,179
Balance beginning of year | $ 3,723,482 |
Shares issued upon exercise of share options, for cash |  | $ 586
Estimated fair value of share options exercised |  | 176
Balance end of year | $ 3,347,086 | $ 3,723,482
Voting common shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance (in shares) | 158,801,722 | 143,317,014
Ending balance (in shares) | 158,801,722 | 158,801,722
Share capital [member] |  |
Disclosure of classes of share capital [line items] |  |
Balance beginning of year | $ 3,007,924 | $ 2,819,101
Shares issued upon exercise of share options, for cash | 0 | 586
Shares issued for acquisition of Integra |  | 188,061
Balance end of year | $ 3,007,924 | $ 3,007,924

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