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Stock Plans - Schedule of Exercise Price Ranges, Characteristics of Outstanding Stock Options (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
$17.83 – $29.33  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (dollars per share) $ 17.83
Range of Exercise Prices, maximum (dollars per share) $ 29.33
Stock Options Outstanding, Shares | shares 533,382
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) $ 21.67
Stock Options Outstanding, Weighted-Average Remaining Life, in years 3 years 6 months 8 days
Stock Options Exercisable, Shares | shares 533,382
Exercisable, Weighted-Average Exercise Price (dollars per share) $ 21.67
Stock Options Exercisable, Weighted-Average Remaining Life, in years 3 years 6 months 8 days
$33.55 – $40.88  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (dollars per share) $ 33.55
Range of Exercise Prices, maximum (dollars per share) $ 40.88
Stock Options Outstanding, Shares | shares 461,108
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) $ 36.88
Stock Options Outstanding, Weighted-Average Remaining Life, in years 3 years 11 months 2 days
Stock Options Exercisable, Shares | shares 461,108
Exercisable, Weighted-Average Exercise Price (dollars per share) $ 36.88
Stock Options Exercisable, Weighted-Average Remaining Life, in years 3 years 11 months 2 days
$41.26 – $51.69  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (dollars per share) $ 41.26
Range of Exercise Prices, maximum (dollars per share) $ 51.69
Stock Options Outstanding, Shares | shares 700,185
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) $ 47.99
Stock Options Outstanding, Weighted-Average Remaining Life, in years 5 years 11 months 8 days
$41.26 – $48.95  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (dollars per share) $ 41.26
Range of Exercise Prices, maximum (dollars per share) $ 48.95
Stock Options Exercisable, Shares | shares 286,175
Exercisable, Weighted-Average Exercise Price (dollars per share) $ 45.63
Stock Options Exercisable, Weighted-Average Remaining Life, in years 2 years 7 months 13 days
$17.83 – $51.69  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (dollars per share) $ 17.83
Range of Exercise Prices, maximum (dollars per share) $ 51.69
Stock Options Outstanding, Shares | shares 1,694,675
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) $ 36.69
Stock Options Outstanding, Weighted-Average Remaining Life, in years 4 years 7 months 13 days
$17.83 – $48.95  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (dollars per share) $ 17.83
Range of Exercise Prices, maximum (dollars per share) $ 48.95
Stock Options Exercisable, Shares | shares 1,280,665
Exercisable, Weighted-Average Exercise Price (dollars per share) $ 32.50
Stock Options Exercisable, Weighted-Average Remaining Life, in years 3 years 5 months 16 days