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Capital Management - Summary of Capitalization and Ratio (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Capitalisation [Abstract] |  |
Long-term debt | $ 1,706,253 | $ 1,730,437
Shareholders’ equity | 1,557,752 | 1,810,336
Total capitalization | $ 3,264,005 | $ 3,540,773
Long-term debt to long-term debt plus equity ratio | 0.52% | 0.49%

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