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Benefit Plans - Stock Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding (in shares) | shares 1,283,365
Weighted Average Remaining Contractual Life in Years 1 year 9 months 18 days
Weighted Average Exercise Price (in usd per share) $ 16
$10 - $14 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range Limit (in usd per share) 10
Range of Exercise Prices, Upper Range Limit (in usd per share) $ 14
Number of Options Outstanding (in shares) | shares 148,315
Weighted Average Remaining Contractual Life in Years 4 years 9 months 18 days
Weighted Average Exercise Price (in usd per share) $ 12
$14 - $15 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range Limit (in usd per share) 14
Range of Exercise Prices, Upper Range Limit (in usd per share) $ 15
Number of Options Outstanding (in shares) | shares 453,074
Weighted Average Remaining Contractual Life in Years 2 years 2 months 12 days
Weighted Average Exercise Price (in usd per share) $ 15
$15 - $17 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range Limit (in usd per share) 15
Range of Exercise Prices, Upper Range Limit (in usd per share) $ 17
Number of Options Outstanding (in shares) | shares 176,723
Weighted Average Remaining Contractual Life in Years 10 months 24 days
Weighted Average Exercise Price (in usd per share) $ 17
$17 - $18 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range Limit (in usd per share) 17
Range of Exercise Prices, Upper Range Limit (in usd per share) $ 18
Number of Options Outstanding (in shares) | shares 36,496
Weighted Average Remaining Contractual Life in Years 1 month 6 days
Weighted Average Exercise Price (in usd per share) $ 17
$18 - $21 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower Range Limit (in usd per share) 18
Range of Exercise Prices, Upper Range Limit (in usd per share) $ 21
Number of Options Outstanding (in shares) | shares 468,757
Weighted Average Remaining Contractual Life in Years 10 months 24 days
Weighted Average Exercise Price (in usd per share) $ 19