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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
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Incentive Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares, Outstanding       678,679
Number of Shares, Expected to Vest       674,823
Number of Shares, Exercisable       162,679
Weighted Average Exercise Price, Outstanding $ 7.71 $ 7.71 $ 7.70 $ 7.71
Weighted Average Exercise Price, Expected to Vest       $ 7.71
Weighted Average Exercisable, Exercise Price $ 8.07 $ 7.96 $ 7.95 $ 8.07
Weighted Average Remaining Life, Outstanding       85 months
Weighted Average Remaining Contractual Life, Expected to Vest       85 months
Weighted Average Remaining Contractual Life, Exercisable       72 months
Intrinsic Value, Outstanding       $ 10,633
Intrinsic Value, Expected to Vest       10,573
Intrinsic Value, Exercisable       $ 2,490