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Recast of Prior Period Amounts - Summary of Recast Prior Year Comparative Amounts (Details) - CAD ($)
$ in Thousands
 12 Months Ended
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)