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Summary of Information about Stock Options Outstanding (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, Lower Range Limit $ 4.3
Exercise Price, Upper Range Limit $ 7.77
Shares Outstanding 1,750
Shares Vested and Exercisable 1,729
Weighted Average Remaining Contractual Life of Shares Outstanding (in years) 3 years 1 month 6 days
Aggregate Intrinsic Value at December 31, 2012 $ 6