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Capital Stock - Summary of Stock Option Activity and Related Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Options Outstanding-beginning of year 5,285 5,713 6,123
Options Granted 73 433 96
Options Exercised (1,039) (733) (363)
Options Forfeited/Expired (82) (128) (143)
Options Outstanding-end of year 4,237 5,285 5,713
Options Exercisable-end of year 3,848 4,561 4,656
Weighted-Average Exercise Price, Outstanding-beginning of year $ 34.40 $ 32.47 $ 31.54
Weighted-Average Exercise Price, Granted $ 34.07 $ 27.69 $ 34.93
Weighted-Average Exercise Price, Exercised $ 26.21 $ 15.85 $ 16.14
Weighted-Average Exercise Price, Forfeited/Expired $ 38.46 $ 31.81 $ 33.11
Weighted-Average Exercise Price, Outstanding-end of year $ 36.33 $ 34.40 $ 32.47
Weighted-Average Exercise Price, Exercisable-end of year $ 37.03 $ 35.54 $ 35.40