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Share-Based Compensation - Schedule of Outstanding and Exercisable Options Granted (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Outstanding 229,533
Exercisable 229,533
25.00-30.00 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Lower exercise price | $ / shares $ 25.00
Upper exercise price | $ / shares $ 30.00
Outstanding 60,216
Remaining Contractual Life (Years) 7 months 6 days
Exercisable 60,216
30.01 - 35.00 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Lower exercise price | $ / shares $ 30.01
Upper exercise price | $ / shares $ 35.00
Outstanding 2,246
Remaining Contractual Life (Years) 4 months 24 days
Exercisable 2,246
35.01 - 40.00 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Lower exercise price | $ / shares $ 35.01
Upper exercise price | $ / shares $ 40.00
Outstanding 161,533
Remaining Contractual Life (Years) 6 years 1 month 6 days
Exercisable 161,533
45.01 - 50.00 [Member]  
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]  
Lower exercise price | $ / shares $ 45.01
Upper exercise price | $ / shares $ 50.00
Outstanding 5,538
Remaining Contractual Life (Years) 7 years
Exercisable 5,538