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Summary of Stock Options Summarized by Exercise Price (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Incentive Stock Option Plan
Dec. 31, 2011
Incentive Stock Option Plan
Dec. 31, 2012
Incentive Stock Option Plan
Range One
Dec. 31, 2012
Incentive Stock Option Plan
Range Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options exercised, Lower Range             $ 7.50 $ 11.32
Options exercised, Upper Range               $ 14.75
Outstanding Weighted Average, Shares         705,345 1,388,514 678,666 26,679
Outstanding Weighted Average, Remaining Life (Months)         91 months 62 months 91 months 92 months
Outstanding Weighted Average, Exercise Price $ 7.70 $ 7.44 $ 7.65 $ 7.55 $ 7.70 $ 7.44 $ 7.50 $ 12.90
Exercisable Weighted Average, Shares         179,345 745,514 166,000 13,345
Exercisable Weighted Average, Exercise Price $ 7.95 $ 7.26 $ 7.77 $ 7.52 $ 7.95 $ 7.26 $ 7.50 $ 13.52