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Recast of Prior Period Amounts - Summary of Recast Prior Year Comparative Amounts (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Recast Of Prior Year Comparative Amounts [Line Items] |  |
Revenue | $ 1,321,224 | $ 1,003,233
Expenses: |  |
Operating | 926,171 | 661,715
General and administrative | 90,072 | 107,689
Restructuring |  | 5,754
Earnings before income taxes, loss on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of property, plant and equipment, gain on re-measurement of property, plant and equipment and depreciation and amortization | $ 304,981 | 228,075
As Previously Reported [Member] |  |
Disclosure Of Recast Of Prior Year Comparative Amounts [Line Items] |  |
Revenue |  | 951,411
Expenses: |  |
Operating |  | 607,295
General and administrative |  | 110,287
Restructuring |  | 5,754
Earnings before income taxes, loss on redemption and repurchase of unsecured senior notes, finance charges, foreign exchange, impairment of property, plant and equipment, gain on re-measurement of property, plant and equipment and depreciation and amortization |  | 228,075
Revenue Reclassification [Member] |  |
Disclosure Of Recast Of Prior Year Comparative Amounts [Line Items] |  |
Revenue |  | 51,822
Expenses: |  |
Operating |  | 51,822
Expense Reclassification [Member] |  |
Expenses: |  |
Operating |  | 2,598
General and administrative |  | $ (2,598)

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