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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total intrinsic value of stock options exercised $ 275,000 $ 163,500
Unrecognized stock option compensation cost 2,600,000  
Stock compensation expense 803,000 750,000
Stock compensation expense, stock option 501,000 597,000
Stock compensation expense, Performance based and restricted share 270,000 100,000
Stock compensation expense, stock awards granted $ 32,000 $ 53,000
Long Term Incentive Plan 2000 | After Amendment    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for grant 471,450  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period 1 year 9 months 18 days  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period 2 years 3 months 18 days  
Restricted stock vested 0  
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period [1] 1 year 9 months  
Performance Shares | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares range percentage 150.00%  
[1] Represents the target number of shares to be issued for each performance share award.