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Share Based Compensation Plans - Information Pertaining to Outstanding and Exercisable Options (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Range of Exercise Prices  
Range of Exercise Prices, Minimum $ 21.14
Range of Exercise Prices, Maximum $ 40.14
Number Outstanding 150,580
Weighted Average Remaining Contractual Life (Years) 3 years 2 months 27 days
Weighted Average Exercise Price $ 31.14
Range One [Member]
 
Range of Exercise Prices  
Range of Exercise Prices, Minimum $ 21.14
Range of Exercise Prices, Maximum $ 24.99
Number Outstanding 42,985
Weighted Average Remaining Contractual Life (Years) 5 years 6 months 18 days
Weighted Average Exercise Price $ 21.41
Range Two [Member]
 
Range of Exercise Prices  
Range of Exercise Prices, Minimum $ 25
Range of Exercise Prices, Maximum $ 29.99
Number Outstanding 2,792
Weighted Average Remaining Contractual Life (Years) 5 years 6 months 4 days
Weighted Average Exercise Price $ 25.76
Range Three [Member]
 
Range of Exercise Prices  
Range of Exercise Prices, Minimum $ 30
Range of Exercise Prices, Maximum $ 34.99
Number Outstanding 45,470
Weighted Average Remaining Contractual Life (Years) 3 years 0 months 7 days
Weighted Average Exercise Price $ 31.25
Range Four [Member]
 
Range of Exercise Prices  
Range of Exercise Prices, Minimum $ 35
Range of Exercise Prices, Maximum $ 39.99
Number Outstanding 29,567
Weighted Average Remaining Contractual Life (Years) 2 years 6 months 22 days
Weighted Average Exercise Price $ 36.54
Range Five [Member]
 
Range of Exercise Prices  
Range of Exercise Prices, Minimum $ 40
Range of Exercise Prices, Maximum $ 40.14
Number Outstanding 29,766
Weighted Average Remaining Contractual Life (Years) 8 months 19 days
Weighted Average Exercise Price $ 40.14