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Share-based Compensation - Schedule of Stock Options Outstanding and Exercisable by Exercise Price Range (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
$16.62 – $25.01 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) $ 16.62
Exercise price, high end of range (in dollars per share) $ 25.01
Number outstanding (in shares) | shares 106,207
Weighted Average Remaining Contractual Life of options outstanding (in years) 5 years 8 months 27 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 22.32
Number Exercisable (in shares) | shares 80,271
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 22.55
$25.05 – $29.23 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 25.05
Exercise price, high end of range (in dollars per share) $ 29.23
Number outstanding (in shares) | shares 102,750
Weighted Average Remaining Contractual Life of options outstanding (in years) 5 years 22 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 27.57
Number Exercisable (in shares) | shares 82,750
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 27.82
$30.78 – $32.28 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 30.78
Exercise price, high end of range (in dollars per share) $ 32.28
Number outstanding (in shares) | shares 99,650
Weighted Average Remaining Contractual Life of options outstanding (in years) 6 years 7 months 17 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 31.96
Number Exercisable (in shares) | shares 57,288
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 31.90
$33.12 – $33.12 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 33.12
Exercise price, high end of range (in dollars per share) $ 33.12
Number outstanding (in shares) | shares 142,815
Weighted Average Remaining Contractual Life of options outstanding (in years) 8 years 6 months
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 33.12
Number Exercisable (in shares) | shares 35,708
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 33.12
$33.24 – $36.25 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 33.24
Exercise price, high end of range (in dollars per share) $ 36.25
Number outstanding (in shares) | shares 121,875
Weighted Average Remaining Contractual Life of options outstanding (in years) 7 years 8 months 27 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 35.51
Number Exercisable (in shares) | shares 52,051
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 35.82
$36.46 – $40.19 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 36.46
Exercise price, high end of range (in dollars per share) $ 40.19
Number outstanding (in shares) | shares 262,750
Weighted Average Remaining Contractual Life of options outstanding (in years) 6 years 7 months 21 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 38.93
Number Exercisable (in shares) | shares 45,438
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 39.24
$41.73 – $42.89 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 41.73
Exercise price, high end of range (in dollars per share) $ 42.89
Number outstanding (in shares) | shares 59,500
Weighted Average Remaining Contractual Life of options outstanding (in years) 4 years 8 months 16 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 41.93
Number Exercisable (in shares) | shares 37,500
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 41.37
$44.39 – $44.39 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 44.39
Exercise price, high end of range (in dollars per share) $ 44.39
Number outstanding (in shares) | shares 168,432
Weighted Average Remaining Contractual Life of options outstanding (in years) 9 years 6 months
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 44.39
$44.87 – $50.50 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 44.87
Exercise price, high end of range (in dollars per share) $ 50.50
Number outstanding (in shares) | shares 65,700
Weighted Average Remaining Contractual Life of options outstanding (in years) 5 months 23 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 45.17
Number Exercisable (in shares) | shares 65,700
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 45.17
$50.99 – $50.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 50.99
Exercise price, high end of range (in dollars per share) $ 50.99
Number outstanding (in shares) | shares 7,500
Weighted Average Remaining Contractual Life of options outstanding (in years) 15 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 50.99
Number Exercisable (in shares) | shares 7,500
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 50.99
$16.62 – $50.99 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise price, low end of range (in dollars per share) 16.62
Exercise price, high end of range (in dollars per share) $ 50.99
Number outstanding (in shares) | shares 1,137,179
Weighted Average Remaining Contractual Life of options outstanding (in years) 6 years 8 months 9 days
Weighted Average Exercise Price of options outstanding (in dollars per share) $ 36.05
Number Exercisable (in shares) | shares 464,206
Weighted Average Exercise Price of options exercisable (in dollars per share) $ 33.76