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Summary of Stock Option Information and Weighted Average Exercise Prices (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Number of shares      
Number of stock options outstanding at beginning of period 14,630 19,299 23,265
Number of stock options granted 1,488 1,827 2,211
Number of stock options exercised (6,828) (6,312) (5,977)
Number of stock options forfeited (60) (134) (163)
Number of stock options canceled (12) (50) (37)
Number of stock options outstanding at end of period 9,218 14,630 19,299
Number of stock options exercisable at end of period 6,135 10,971 14,359
Weighted Average Exercise Price      
Weighted average exercise price of stock options outstanding at beginning of period $ 22.34 $ 20.30 $ 19.48
Weighted average exercise price of stock options granted $ 42.70 $ 34.29 $ 26.38
Weighted average exercise price of stock options exercised $ 19.74 $ 19.50 $ 19.34
Weighted average exercise price of stock options forfeited $ 33.18 $ 27.13 $ 20.50
Weighted average exercise price of stock options canceled $ 20.02 $ 20.02 $ 17.46
Weighted average exercise price of stock options outstanding at end of period $ 27.48 $ 22.34 $ 20.30
Weighted average exercise price of stock options exercisable at end of period $ 22.70 $ 20.03 $ 19.39