Quarterly report pursuant to Section 13 or 15(d)

Stock Options Granted Pursuant to Equity Incentive Plan (Detail)

v2.4.0.6
Stock Options Granted Pursuant to Equity Incentive Plan (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]  
Outstanding, Shares, Beginning of Period 206,400
Stock options granted 0
Exercised, Shares (118,364)
Cancelled, Shares (208)
Outstanding, Shares, End of Period 87,828
Exercisable, Shares 87,828
Outstanding, Weighted average exercise price, Beginning of Period $ 7.62
Granted, Weighted average exercise price $ 0
Exercised, Weighted average exercise price $ 6.95
Cancelled, Weighted average exercise price $ 6.95
Outstanding, Weighted average exercise price, End of Period $ 8.51
Exercisable, Weighted Average Exercise Price $ 8.51
Outstanding, Weighted Average Remaining Contractual Term 1 year
Exercisable, Weighted Average Remaining Contractual Term 1 year
Outstanding, Aggregate Intrinsic Value $ 1,043,979
Exercisable, Aggregate Intrinsic Value $ 1,043,979