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Summary of Changes in Long Term Borrowings (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of long term debt [Line Items] |  |
Beginning balance | $ 1,906,934 |
Changes from financing cash flows: |  |
Proceeds from issue of senior notes | 509,180 |
Redemption and repurchase of unsecured senior notes | (571,975) | $ (677,704)
Debt issue costs | (9,196) | (10,752)
Changes from financing cash flows | (71,991) |
Loss on redemption and repurchase of unsecured senior notes | 9,021 | 239
Amortization of debt issue costs | 8,173 |
Foreign exchange adjustment | (121,700) |
Ending balance | 1,730,437 | 1,906,934
Unsecured Senior Notes [Member] |  |
Disclosure of long term debt [Line Items] |  |
Beginning balance | 1,933,993 |
Changes from financing cash flows: |  |
Proceeds from issue of senior notes | 509,180 |
Redemption and repurchase of unsecured senior notes | (571,975) |
Changes from financing cash flows | (62,795) |
Loss on redemption and repurchase of unsecured senior notes | 9,021 |
Foreign exchange adjustment | (121,700) |
Ending balance | 1,758,519 | 1,933,993
Debt Issue Costs [Member] |  |
Disclosure of long term debt [Line Items] |  |
Beginning balance | (27,059) |
Changes from financing cash flows: |  |
Debt issue costs | (9,196) |
Changes from financing cash flows | (9,196) |
Amortization of debt issue costs | 8,173 |
Ending balance | $ (28,082) | $ (27,059)

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