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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