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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of stock options exercised     $ 900,000 $ 600,000
Unrecognized stock option compensation cost $ 1,800,000   1,800,000  
Stock compensation expense 800,000 $ 800,000 2,115,000 2,314,000
Stock compensation expense, stock option 400,000 500,000 1,000,000 1,700,000
Stock compensation expense, Performance based and restricted share $ 400,000 $ 300,000 1,100,000 500,000
Stock compensation expense, stock awards granted     $ 32,000 $ 53,000
Amended and Restated Long Term Incentive Plan Two Thousand        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 410,504   410,504  
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 9 months 18 days  
Total fair value of restricted stock vested     $ 682,000  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average recognition period [1]     1 year 9 months 18 days  
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-based award.