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Stock-Based Compensation - Schedule of Options Outstanding (Detail) (CAD)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, beginning balance 6,867,367 11,142,450 7,150,544
Number of options, Granted 1,389,000   6,341,000
Number of options, Exercised (1,525,159) (2,737,253) (1,504,616)
Number of options, Cancelled (107,966) (1,537,830) (844,478)
Number of options, Vested         
Number of options outstanding, ending balance 6,623,242 6,867,367 11,142,450
Weighted average exercise price outstanding, Beginning balance 31.54 34.22 34.26
Weighted average exercise price, Granted 48.22   34.04
Weighted average exercise price, Exercised 28.46 33.28 34.31
Weighted average exercise price, Cancelled 53.14 48.86 33.04
Weighted average exercise price, Vested         
Weighted average exercise price outstanding, Ending Balance 35.39 31.54 34.22
Number of options exercisable outstanding, beginning balance 2,066,700 3,362,116 4,988,544
Number of options exercisable, Exercised (1,525,159) (2,737,253) (1,504,616)
Number of options exercisable, Cancelled (58,967) (1,426,164) (844,478)
Number of options exercisable, Vested 2,745,000 2,868,001 722,666
Number of options exercisable outstanding, Ending Balance 3,227,574 2,066,700 3,362,116