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Condensed Consolidating Statement of Comprehensive Income (Loss) (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of subsidiaries [Line Items] |  |
Net income (loss) | $ (294,270) | $ (132,036)
Other comprehensive income (loss) | 30,404 | (24,846)
Comprehensive loss | (263,866) | (156,882)
Parent Company [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Net income (loss) | (294,054) | (133,495)
Other comprehensive income (loss) | (145,226) | 121,699
Comprehensive loss | (439,280) | (11,796)
Guarantor Subsidiaries [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Net income (loss) | (161,200) | 25,690
Other comprehensive income (loss) | 129,804 | (110,717)
Comprehensive loss | (31,396) | (85,027)
Non-Guarantor Subsidiaries [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Net income (loss) | (7,774) | (11,628)
Other comprehensive income (loss) | 45,190 | (35,661)
Comprehensive loss | 37,416 | (47,289)
Consolidating Adjustments [Member] |  |
Disclosure of subsidiaries [Line Items] |  |
Net income (loss) | 168,758 | (12,603)
Other comprehensive income (loss) | 636 | (167)
Comprehensive loss | $ 169,394 | $ (12,770)

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