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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 10, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount of limitation on deductibility under Section 162(m) of Internal Revenue Code (in dollars) $ 1,000,000        
Total intrinsic value of stock options exercised       $ 639,000.0 $ 3,000,000
Unrecognized stock option compensation cost   $ 3,400,000   3,400,000  
Stock compensation expense   800,000 $ 680,000 2,314,000 2,133,000
Stock compensation expense, stock option   500,000 600,000 1,700,000 1,900,000
Stock compensation expense, Performance based and restricted share   300,000 $ 83,000 $ 500,000 $ 200,000
Stock compensation expense, stock awards granted in 2015   $ 53,000      
Long Term Incentive Plan 2000          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increase shares available for grant under the plan 650,000        
Shares available for awards   656,210   656,210  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average recognition period       2 years 1 month 6 days  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average recognition period       2 years 9 months 18 days  
Total fair value of restricted stock vested       $ 374,000  
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average recognition period       2 years 3 months 18 days  
Performance Shares | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares range percentage   150.00%