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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of Shares, Outstanding         705,345 1,388,514
Number of Shares, Expected to Vest         699,537 1,375,499
Number of Shares, Exercisable         179,345 745,514
Weighted Average Exercise Price, Outstanding $ 7.70 $ 7.44 $ 7.65 $ 7.55 $ 7.70 $ 7.44
Weighted Average Exercise Price, Expected to Vest         $ 7.70 $ 7.44
Weighted Average Exercisable, Exercise Price $ 7.95 $ 7.26 $ 7.77 $ 7.52 $ 7.95 $ 7.26
Weighted Average Remaining Life, Outstanding         91 months 62 months
Weighted Average Remaining Contractual Life, Expected to Vest         91 months 61 months
Weighted Average Remaining Contractual Life, Exercisable         78 months 22 months
Intrinsic Value, Outstanding         $ 16,481 $ 8,494
Intrinsic Value, Expected to Vest         16,345 8,421
Intrinsic Value, Exercisable         $ 4,147 $ 4,834