v2.4.0.6
Stock-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option and incentive plan, maximum issuable shares1,200,000 1,200,000 
Stock option and incentive plan, options granted to employees vesting period  5 years 
Stock option expense$ 24,000$ 79,000$ 51,000$ 157,000
Stock option expense, net of tax$ 24,000$ 79,000$ 51,000$ 157,000