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Summary of Accumulated Other Comprehensive Income (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | $ 131,610 |
Other comprehensive income (loss) | 30,404 | $ (24,846)
Ending Balance | 162,014 | 131,610
Unrealized Foreign Currency Translation Gains (Losses) [member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 440,733 | 587,278
Other comprehensive income (loss) | 175,630 | (146,545)
Ending Balance | 616,363 | 440,733
Foreign Exchange Gain (Loss) on Net Investment Hedge [member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | (309,123) | (430,822)
Other comprehensive income (loss) | (145,226) | 121,699
Ending Balance | (454,349) | (309,123)
Accumulated Other Comprehensive Income [Member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 131,610 | 156,456
Other comprehensive income (loss) | 30,404 | (24,846)
Ending Balance | $ 162,014 | $ 131,610

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