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Summary Stock Options Outstanding and Exercisable (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding | shares 372,561
Options Exercisable | shares 282,461
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 6 months
Options Exercisable, Weighted Average Contractual Life (Years) 4 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price per Share $ 48.24
Options Exercisable, Weighted Average Exercise Price 46.39
Range One  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Exercise Price 35.64
Maximum Exercise Price $ 40.00
Options Outstanding | shares 48,719
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 7 months 6 days
Options Outstanding, Weighted Average Exercise Price per Share $ 36.96
Range Two  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Exercise Price 40.01
Maximum Exercise Price $ 45.00
Options Outstanding | shares 95,888
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 6 months
Options Outstanding, Weighted Average Exercise Price per Share $ 41.76
Range Three  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Exercise Price 45.01
Maximum Exercise Price $ 58.06
Options Outstanding | shares 227,954
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 3 months 18 days
Options Outstanding, Weighted Average Exercise Price per Share $ 53.37
Range Four  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Exercise Price 35.64
Maximum Exercise Price $ 40.00
Options Exercisable | shares 48,719
Options Exercisable, Weighted Average Contractual Life (Years) 2 years 7 months 6 days
Options Exercisable, Weighted Average Exercise Price $ 36.96
Range Five  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Exercise Price 40.01
Maximum Exercise Price $ 45.00
Options Exercisable | shares 95,888
Options Exercisable, Weighted Average Contractual Life (Years) 3 years 6 months
Options Exercisable, Weighted Average Exercise Price $ 41.76
Range Six  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Minimum Exercise Price 45.01
Maximum Exercise Price $ 56.40
Options Exercisable | shares 137,854
Options Exercisable, Weighted Average Contractual Life (Years) 5 years 1 month 6 days
Options Exercisable, Weighted Average Exercise Price $ 52.94