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Incentive Compensation Plan - Outstanding Stock Options (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Outstanding, beginning of the year, Shares 496,863 640,866 728,552
Granted, Shares 0 0 0
Exercised, Shares (130,672) (13,760) 0.00
Forfeited, Shares (169,869) (130,243) (87,686)
Balance, end of the year, Shares 196,322 496,863 640,866
Exercisable at the end of the year, Shares 196,322 496,863 640,866
Outstanding, beginning of the year, Weighted Average Exercise Price $ 10.03 $ 10.05 $ 10.18
Granted, Weighted Average Exercise Price $ 0.00 $ 0.00 $ 0.00
Exercised, Weighted Average Exercise Price $ 6.76 $ 5.29 $ 0.00
Forfeited, Weighted Average Exercise Price $ 10.68 $ 10.61 $ 11.19
Balance, end of the year, Weighted Average Exercise Price $ 11.64 $ 10.03 $ 10.05
Exercisable at the end of the year, Weighted Average Exercise Price $ 11.64 $ 10.03 $ 10.05