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Stock-Based Compensation - Schedule of Options Outstanding (Detail) (CAD)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of options outstanding, beginning balance 6,623,242 6,867,367 11,142,450
Number of options, Exercised (2,805,969) (1,525,159) (2,737,253)
Number of options, Cancelled (119,165) (107,966) (1,537,830)
Number of options, Vested 0 0 0
Number of options outstanding, ending balance 4,758,108 6,623,242 6,867,367
Number of options, Granted 1,060,000 1,389,000  
Weighted average exercise price outstanding, Beginning balance 35.39 31.54 34.22
Weighted average exercise price, Exercised 31.99 28.46 33.28
Weighted average exercise price, Cancelled 51.46 53.14 48.86
Weighted average exercise price, Vested 0 0 0
Weighted average exercise price outstanding, Ending Balance 41.82 35.39 31.54
Weighted average exercise price, Granted 57.02 48.22  
Number of options exercisable outstanding, beginning balance 3,227,574 2,066,700 3,362,116
Number of options exercisable, Cancelled (31,667) (58,967) (1,426,164)
Number of options exercisable, Vested 2,457,171 2,745,000 2,868,001
Number of options exercisable outstanding, Ending Balance 2,847,109 3,227,574 2,066,700
Number of options exercisable, Exercised (2,805,969)