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Stock Compensation - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 13, 2012
2000 Long-Term Incentive Plan
Jun. 30, 2012
2000 Long-Term Incentive Plan
Jun. 30, 2012
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock options exercised, total intrinsic value     $ 668,440 $ 41,000      
Stock Compensation Expense 754,000 675,000 1,500,000 1,400,000      
Unrecognized share based compensation expenses $ 5,300,000   $ 5,300,000        
Unrecognized compensation cost expected to be recognized, vesting period     1 year 10 months 24 days        
Restricted Stock Granted in Period             23,394
Restricted stock vesting period             One year
Fair value of restricted stock at grant date             $ 270,000
Increase in shares available for grant under the Plan         700,000    
Shares available for awards           709,832