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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock option compensation cost $ 1,400,000  
Stock compensation expense 838,000 $ 804,000
Stock compensation expense, stock option 200,000 400,000
Stock compensation expense, Performance based and restricted share $ 600,000 $ 400,000
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period 2 years 6 months  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period 2 years 7 months 6 days  
Total fair value of performance-based awards, vested $ 0  
Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average recognition period [1] 1 year 6 months  
Total fair value of performance-based awards, vested $ 792,000  
Number of shares range percentage 150.00%  
Performance Shares | Amended and Restated Long Term Incentive Plan Two Thousand    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for grant 374,558  
[1] Represents the target number of shares to be issued for each performance-based award.