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Incentive Compensation Plan - Outstanding Stock Options (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, beginning of the year, Shares 15,000 27,000 196,322
Granted, Shares 0 0 0
Exercised, Shares 0 0 0
Forfeited, Shares (15,000) (12,000) (169,322)
Balance, end of the year, Shares 0 15,000 27,000
Exercisable at the end of the year, Shares 0 15,000 27,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Outstanding, beginning of the year, Weighted Average Exercise Price $ 14.55 $ 14.49 $ 11.64
Granted, Weighted Average Exercise Price 0.00 0.00 0.00
Exercised, Weighted Average Exercise Price 0.00 0.00 0.00
Forfeited, Weighted Average Exercise Price 14.55 14.41 11.19
Balance, end of the year, Weighted Average Exercise Price 0.00 14.55 14.49
Exercisable at the end of the year, Weighted Average Exercise Price $ 0.00 $ 14.55 $ 14.49