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Summary of Operating Loss to Loss Before Income Taxes (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Operating Segments [Abstract] |  |
Total segment operating loss | $ (198,073) | $ (88,078)
Foreign exchange | 4,017 | (2,970)
Finance charges | 127,178 | 137,928
Loss (gain) on redemption and repurchase of unsecured senior notes | (5,672) | 9,021
Loss before income taxes | $ (323,596) | $ (232,057)

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