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Accounting Changes - Disclosure of comparative information prepared under previous GAAP (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Profit (loss) [abstract] |  |  |
Revenues | $ 2,249,000 | $ 2,307,000 | $ 2,397,000
(Note 6) | (1,100,000) | (1,016,000) | (963,000)
Net interest expense | (250,000) | (247,000) | (229,000)
Net earnings (loss) | (90,000) | (118,000) | $ 276,000
Statement of financial position [abstract] |  |  |
Deferred income tax liabilities (Note 11) | 501,000 | 549,000 |
Contract liability | 87,000 | 62,000 |
Deficit | (1,496,000) | $ (1,209,000) |
Previous GAAP [member] |  |  |
Profit (loss) [abstract] |  |  |
Revenues | 2,253,000 |  |
(Note 6) | (1,109,000) |  |
Net interest expense | (243,000) |  |
Net earnings (loss) | (88,000) |  |
Statement of financial position [abstract] |  |  |
Deferred income tax liabilities (Note 11) | 505,000 |  |
Contract liability | 68,000 |  |
Deficit | (1,481,000) |  |
Effect of transition to IFRSs [member] |  |  |
Profit (loss) [abstract] |  |  |
Revenues | (4,000) |  |
(Note 6) | 9,000 |  |
Net interest expense | (7,000) |  |
Net earnings (loss) | (2,000) |  |
Statement of financial position [abstract] |  |  |
Deferred income tax liabilities (Note 11) | (4,000) |  |
Contract liability | 19,000 |  |
Deficit | $ (15,000) |  |

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