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Stock Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 28, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total intrinsic value of stock options exercised       $ 221 $ 900
Unrecognized stock option compensation cost   $ 1,200   1,200  
Stock compensation expense   1,300 $ 1,000 3,027 2,482
Stock compensation expense, stock option   200 200 600 800
Stock compensation expense, Performance based and restricted share   $ 1,100 $ 800 $ 2,400 $ 1,700
Amended and Restated Long Term Incentive Plan Two Thousand          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Revised terms and conditions of the plan       On June 28, 2018, the shareholders of the Company approved an amendment and restatement of the Company's Amended and Restated 2000 Long-Term Incentive Plan (the "Plan"). The amendment and restatement of the Plan revised the terms and conditions of the Plan to, among other things, increase the shares available for grant under the Plan by 900,000 shares.  
Increase in share available for grant 900,000        
Shares available for grant   900,439   900,439  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average recognition period       1 year 8 months 12 days  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average recognition period       1 year 8 months 12 days  
Total fair value of performance-based awards, vested       $ 1,000  
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average recognition period [1]       1 year 10 months 25 days  
Total fair value of performance-based awards, vested       $ 792  
Number of shares range percentage       150.00%  
[1] Represents the target number of shares to be issued for each performance-based award.