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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total intrinsic value of stock options exercised $ 27,000 $ 275,000
Unrecognized stock option compensation cost 1,500,000  
Stock compensation expense 804,000 803,000
Stock compensation expense, stock option 400,000 500,000
Stock compensation expense, Performance based and restricted share $ 400,000 300,000
Stock compensation expense, stock awards granted   $ 32,000
Amended and Restated Long Term Incentive Plan Two Thousand    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for grant 341,115  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period 2 years  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period 2 years 8 months 12 days  
Total fair value of restricted stock vested $ 28,000  
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period [1] 1 year 6 months  
Number of shares range percentage 150.00%  
[1] Represents the target number of shares to be issued for each performance-based award.