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Stock Plans - Schedule of Exercise Price Ranges, Characteristics of Outstanding Stock Options (Detail)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
$17.83 – $33.00  
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) $ 33.00
Stock Options Outstanding, Shares | shares 85,607
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) $ 23.98
Stock Options Outstanding, Weighted-Average Remaining Life 1 year 9 months 26 days
Stock Options Exercisable, Shares | shares 85,607
Stock Options Exercisable, Weighted-Average Exercise Price (dollars per share) $ 23.98
Stock Options Exercisable, Weighted-Average Remaining Life 1 year 9 months 26 days
$33.01 – $45.00  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (dollars per share) $ 33.01
Range of Exercise Prices, maximum (dollars per share) $ 45.00
Stock Options Outstanding, Shares | shares 464,364
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) $ 40.23
Stock Options Outstanding, Weighted-Average Remaining Life 5 years 7 months 2 days
Stock Options Exercisable, Shares | shares 260,278
Stock Options Exercisable, Weighted-Average Exercise Price (dollars per share) $ 36.88
Stock Options Exercisable, Weighted-Average Remaining Life 3 years 6 months 26 days
$45.01 – $51.69  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, minimum (dollars per share) $ 45.01
Range of Exercise Prices, maximum (dollars per share) $ 51.69
Stock Options Outstanding, Shares | shares 405,475
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) $ 49.61
Stock Options Outstanding, Weighted-Average Remaining Life 5 years 11 months 16 days
Stock Options Exercisable, Shares | shares 268,529
Stock Options Exercisable, Weighted-Average Exercise Price (dollars per share) $ 50.10
Stock Options Exercisable, Weighted-Average Remaining Life 5 years 4 months 2 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 955,446
Stock Options Outstanding, Weighted-Average Exercise Price (dollars per share) $ 42.75
Stock Options Outstanding, Weighted-Average Remaining Life 5 years 4 months 28 days
Stock Options Exercisable, Shares | shares 614,414
Stock Options Exercisable, Weighted-Average Exercise Price (dollars per share) $ 40.86
Stock Options Exercisable, Weighted-Average Remaining Life 4 years 1 month 6 days