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Summary of Accumulated Other Comprehensive Income (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | $ 156,456 |
Other comprehensive loss | (24,846) | $ (9,645)
Ending Balance | 131,610 | 156,456
Unrealized Foreign Currency Translation Gains (Losses) [member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 587,278 | 663,886
Other comprehensive loss | (146,545) | (76,608)
Ending Balance | 440,733 | 587,278
Foreign Exchange Gain (Loss) on Net Investment Hedge [member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | (430,822) | (497,785)
Other comprehensive loss | 121,699 | 66,963
Ending Balance | (309,123) | (430,822)
Accumulated Other Comprehensive Income [Member] |  |
Disclosure Of Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 156,456 | 166,101
Other comprehensive loss | (24,846) | (9,645)
Ending Balance | $ 131,610 | $ 156,456

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