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Benefit Plans - Options Outstanding and Options Exercisable by Exercise Price with Weighted-Average Remaining Contractual Life for Options Outstanding and Weighted-Average Exercise Price (Detail)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Exercise Price 20-25 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit $ 20
Exercise Price Upper Range Limit $ 25
Options Outstanding, Number | shares 256,640
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 3 years 2 months 1 day
Options Outstanding, Weighted-Average Grant Date Value $ 24.60
Options Exercisable, Number | shares 128,440
Options Exercisable, Weighted-Average Grant Date Value $ 24.60
Exercise Price 25-30 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit 25
Exercise Price Upper Range Limit $ 30
Options Outstanding, Number | shares 6,150
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 3 years 1 month 17 days
Options Outstanding, Weighted-Average Grant Date Value $ 25.13
Options Exercisable, Number | shares 1,120
Options Exercisable, Weighted-Average Grant Date Value $ 25.14
Exercise Price 30-35 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit 30
Exercise Price Upper Range Limit $ 35
Options Outstanding, Number | shares 306,810
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 3 years 4 months 24 days
Options Outstanding, Weighted-Average Grant Date Value $ 33.48
Options Exercisable, Number | shares 155,710
Options Exercisable, Weighted-Average Grant Date Value $ 33.04
Exercise Price 35-40 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit 35
Exercise Price Upper Range Limit $ 40
Options Outstanding, Number | shares 6,800
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 4 years
Options Outstanding, Weighted-Average Grant Date Value $ 39.19
Options Exercisable, Number | shares 4,080
Options Exercisable, Weighted-Average Grant Date Value $ 39.19
Exercise Price 40-45 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit 40
Exercise Price Upper Range Limit $ 45
Options Outstanding, Number | shares 3,740
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 4 years 8 months 1 day
Options Outstanding, Weighted-Average Grant Date Value $ 40.37
Exercise Price 20-45 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price Lower Range Limit 20
Exercise Price Upper Range Limit $ 45
Options Outstanding, Number | shares 580,140
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 3 years 3 months 21 days
Options Outstanding, Weighted-Average Grant Date Value $ 29.57
Options Exercisable, Number | shares 289,350
Options Exercisable, Weighted-Average Grant Date Value $ 29.35