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Supplemental Information - Additional Information (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Supplemental Information [Line Items]    
Operating expense $ 926,171 $ 661,715
General and administrative expense 90,072 107,689
Depreciation and Amortization, Gain on Re-Measurement, Loss on Asset Decommissioning, and Impairment of Property, Plant and Equipment [Member]    
Supplemental Information [Line Items]    
Operating expense 364,200 369,700
General and administrative expense $ 13,500 $ 14,400