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Summary of Changes in Long Term Borrowings (Detail) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of long term debt [Line Items] |  |
Beginning balance | $ 1,730,437 | $ 1,906,934
Proceeds from issue of senior notes |  | 509,180
Redemption and repurchase of unsecured senior notes | (168,722) | (571,975)
Debt issuance costs |  | (9,196)
Changes from financing cash flows |  | (71,991)
Non-cash changes: |  |
Loss (gain) on redemption and repurchase of unsecured senior notes | (5,672) | 9,021
Amortization of debt issue costs | 4,984 | 8,173
Foreign exchange adjustment | 145,226 | (121,700)
Ending balance | 1,706,253 | 1,730,437
Financing: |  |
Redemption and repurchase of unsecured senior notes | (168,722) | (571,975)
Unsecured Senior Notes [Member] |  |
Disclosure of long term debt [Line Items] |  |
Beginning balance | 1,758,519 | 1,933,993
Proceeds from issue of senior notes |  | 509,180
Redemption and repurchase of unsecured senior notes | (168,722) | (571,975)
Changes from financing cash flows |  | (62,795)
Non-cash changes: |  |
Loss (gain) on redemption and repurchase of unsecured senior notes | (5,672) | 9,021
Foreign exchange adjustment | 145,226 | (121,700)
Ending balance | 1,729,351 | 1,758,519
Financing: |  |
Redemption and repurchase of unsecured senior notes | (168,722) | (571,975)
Debt Issue Costs [Member] |  |
Disclosure of long term debt [Line Items] |  |
Beginning balance | (28,082) | (27,059)
Debt issuance costs |  | (9,196)
Changes from financing cash flows |  | (9,196)
Non-cash changes: |  |
Amortization of debt issue costs | 4,984 | 8,173
Ending balance | $ (23,098) | $ (28,082)

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