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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
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares, Outstanding     692,012
Number of Shares, Expected to Vest     686,022
Number of Shares, Exercisable     172,679
Weighted Average Exercise Price, Outstanding $ 7.71 $ 7.70 $ 7.71
Weighted Average Exercise Price, Expected to Vest     $ 7.71
Weighted Average Exercisable, Exercise Price $ 7.96 $ 7.95 $ 7.96
Weighted Average Remaining Life, Outstanding     88 months
Weighted Average Remaining Contractual Life, Expected to Vest     88 months
Weighted Average Remaining Contractual Life, Exercisable     74 months
Intrinsic Value, Outstanding     $ 15,751
Intrinsic Value, Expected to Vest     15,615
Intrinsic Value, Exercisable     $ 3,886