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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Stock Option Activity [Line Items]      
Options Outstanding-beginning of year 5,713 6,123 5,983
Options Granted 433 96 733
Options Exercised (733) (363) (380)
Options Forfeited/Expired (128) (143) (213)
Options Outstanding-end of year 5,285 5,713 6,123
Options Exercisable-end of year 4,561 4,656 3,963
Weighted-Average Exercise Price, Outstanding-beginning of year $ 32.47 $ 31.54 $ 31.46
Weighted-Average Exercise Price, Granted $ 27.69 $ 34.93 $ 24.42
Weighted-Average Exercise Price, Exercised $ 15.85 $ 16.14 $ 15.12
Weighted-Average Exercise Price, Forfeited/Expired $ 31.81 $ 33.11 $ 29.00
Weighted-Average Exercise Price, Outstanding-end of year $ 34.40 $ 32.47 $ 31.54
Weighted-Average Exercise Price, Exercisable-end of year $ 35.54 $ 35.40 $ 36.80