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Summary of Changes in Long Term Borrowings (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of long term debt [Line Items] |  |
Beginning balance | $ 1,706,253 | $ 1,730,437
Redemption and repurchase of unsecured senior notes | (198,387) | (168,722)
Non-cash changes: |  |
Gain on redemption and repurchase of unsecured senior notes | (6,815) | (5,672)
Amortization of debt issue costs | 5,152 | 4,984
Foreign exchange adjustment | (79,022) | 145,226
Ending balance | 1,427,181 | 1,706,253
Unsecured Senior Notes [Member] |  |
Disclosure of long term debt [Line Items] |  |
Beginning balance | 1,729,351 | 1,758,519
Redemption and repurchase of unsecured senior notes | (198,387) | (168,722)
Non-cash changes: |  |
Gain on redemption and repurchase of unsecured senior notes | (6,815) | (5,672)
Foreign exchange adjustment | (79,022) | 145,226
Ending balance | 1,445,127 | 1,729,351
Debt Issue Costs [Member] |  |
Disclosure of long term debt [Line Items] |  |
Beginning balance | (23,098) | (28,082)
Non-cash changes: |  |
Amortization of debt issue costs | 5,152 | 4,984
Ending balance | $ (17,946) | $ (23,098)

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