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Condensed Consolidating Statement of Comprehensive Loss (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [Line Items]    
Net loss $ (132,036) $ (155,555)
Other comprehensive income (loss) (24,846) (9,645)
Comprehensive loss (156,882) (165,200)
Parent Company [Member]    
Disclosure of subsidiaries [Line Items]    
Net loss (133,495) (155,330)
Other comprehensive income (loss) 121,699 66,963
Comprehensive loss (11,796) (88,367)
Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Net loss 25,690 (1,100)
Other comprehensive income (loss) (110,717) (62,459)
Comprehensive loss (85,027) (63,559)
Non-Guarantor Subsidiaries [Member]    
Disclosure of subsidiaries [Line Items]    
Net loss (11,628) (21,942)
Other comprehensive income (loss) (35,661) (11,270)
Comprehensive loss (47,289) (33,212)
Consolidating Adjustments [Member]    
Disclosure of subsidiaries [Line Items]    
Net loss (12,603) 22,817
Other comprehensive income (loss) (167) (2,879)
Comprehensive loss $ (12,770) $ 19,938