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Summary of Operating Earnings (Loss) to Loss Before Income Taxes (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Operating Segments [Abstract] |  |
Operating earnings (loss) | $ 94,577 | $ (198,073)
Foreign exchange | (8,722) | 4,017
Finance charges | 118,453 | 127,178
Gain on redemption and repurchase of unsecured senior notes | (6,815) | (5,672)
Loss before income taxes | $ (8,339) | $ (323,596)

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