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Benefit Plans - Summary of Stock Options and SARs Outstanding by Exercise Price Range (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
20.01 - 30.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards Outstanding, Number of Shares | shares 377,758
Awards Outstanding, Weighted Average Remaining Contractual Life 3 years 22 days
Awards Outstanding, Weighted Average Exercise Price $ 25.472
Awards Exercisable, Number of Shares | shares 377,758
Awards Exercisable, Weighted Average Exercise Price $ 25.472
Range of exercise prices, lower range limit 20.01
Range of exercise prices, upper range limit $ 30.00
30.01 - 40.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards Outstanding, Number of Shares | shares 2,969,582
Awards Outstanding, Weighted Average Remaining Contractual Life 4 years 9 months 26 days
Awards Outstanding, Weighted Average Exercise Price $ 37.168
Awards Exercisable, Number of Shares | shares 2,410,992
Awards Exercisable, Weighted Average Exercise Price $ 37.084
Range of exercise prices, lower range limit 30.01
Range of exercise prices, upper range limit $ 40.00
40.01 - 50.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards Outstanding, Number of Shares | shares 3,844,443
Awards Outstanding, Weighted Average Remaining Contractual Life 5 years 10 months 6 days
Awards Outstanding, Weighted Average Exercise Price $ 43.691
Awards Exercisable, Number of Shares | shares 2,383,360
Awards Exercisable, Weighted Average Exercise Price $ 44.131
Range of exercise prices, lower range limit 40.01
Range of exercise prices, upper range limit $ 50.00
50.01 - 60.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Awards Outstanding, Number of Shares | shares 169,575
Awards Outstanding, Weighted Average Remaining Contractual Life 1 year 22 days
Awards Outstanding, Weighted Average Exercise Price $ 51.080
Awards Exercisable, Number of Shares | shares 169,575
Awards Exercisable, Weighted Average Exercise Price $ 51.080
Range of exercise prices, lower range limit 50.01
Range of exercise prices, upper range limit $ 60.00