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Capital Management - Summary of Capitalization and Ratio (Detail) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Capitalisation [Abstract] |  |
Long-term debt | $ 1,427,181 | $ 1,706,253
Shareholders’ equity | 1,527,432 | 1,557,752
Total capitalization | $ 2,954,613 | $ 3,264,005
Long-term debt to long-term debt plus equity ratio | 0.48% | 0.52%

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