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Benefit Plans - Stock Options Outstanding (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding (in shares) | shares 632,489
Weighted Average Remaining Contractual Life in Years 1 year 7 months 6 days
Weighted Average Exercise Price (in usd per share) $ 14
$10-14  
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 134,681
Weighted Average Remaining Contractual Life in Years 3 years 7 months 6 days
Weighted Average Exercise Price (in usd per share) $ 12
14-15  
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 445,654
Weighted Average Remaining Contractual Life in Years 1 year 1 month 6 days
Weighted Average Exercise Price (in usd per share) $ 15
15-17  
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 3,388
Weighted Average Remaining Contractual Life in Years 1 year 1 month 6 days
Weighted Average Exercise Price (in usd per share) $ 16
18-19  
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) $ 19
Number of Options Outstanding (in shares) | shares 48,766
Weighted Average Remaining Contractual Life in Years 1 month 6 days
Weighted Average Exercise Price (in usd per share) $ 19