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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

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