Long Term Debt (Parenthetical) (Detail) (CAD)	12 Months Ended
	Dec. 31, 2013 D	Dec. 31, 2012
Debt Instrument [Line Items]
Maximum long-term borrowing from affiliate	5,000,000,000
Cancellation period long-term borrowing from affiliate, days	370
Average effective rate for affiliate long-term borrowing	1.30%
Capitalized lease obligations for marine services, average imputed rate	7.00%	9.60%
Total capitalized lease obligations in current liabilities	7,000,000	7,000,000
Principal payments on capital leases, in two years	7,000,000
Principal payments on capital leases, in three years	7,000,000
Principal payments on capital leases, in four years	7,000,000
Principal payments on capital leases, in five years	7,000,000