Stock-Based Compensation Plans - Schedule of Outstanding Options into Two Ranges, Based on Exercise Prices (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices remaining contractual life, outstanding	4 years 6 months
Range of exercise prices shares, outstanding	373
Range of exercise prices weighted average exercise price, outstanding	$ 38
Range of exercise prices shares, exercisable	311
Options Exercisable, Weighted Avg. Exercise Price	$ 36
Outstanding Options with Range Based Exercise Prices Set One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 12.22
Exercise price range, upper range limit	$ 44.05
Range of exercise prices remaining contractual life, outstanding	4 years 2 months 12 days
Range of exercise prices shares, outstanding	199
Range of exercise prices weighted average exercise price, outstanding	$ 29
Range of exercise prices shares, exercisable	190
Options Exercisable, Weighted Avg. Exercise Price	$ 29
Outstanding Options with Range Based Exercise Prices Set Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 45.70
Exercise price range, upper range limit	$ 50.30
Range of exercise prices remaining contractual life, outstanding	4 years 10 months 24 days
Range of exercise prices shares, outstanding	174
Range of exercise prices weighted average exercise price, outstanding	$ 48
Range of exercise prices shares, exercisable	121
Options Exercisable, Weighted Avg. Exercise Price	$ 48