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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 22, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total intrinsic value of stock options exercised       $ 900,000 $ 900,000
Unrecognized stock option compensation cost   $ 1,300,000   1,300,000  
Stock compensation expense   1,000,000 $ 800,000 2,482,000 2,115,000
Stock compensation expense, stock option   200,000 400,000 800,000 1,000,000
Stock compensation expense, Performance based and restricted share   $ 800,000 $ 400,000 $ 1,700,000 1,100,000
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]          
Revised terms and conditions of the plan The Plan revised the terms and conditions of the Amended and Restated 2000 Long-Term Incentive Plan to increase the shares available for grant under the plan by 437,500 shares, permit certain awards under the Plan to continue to qualify for the exemption from the $1.0 million deduction limit under Section 162(m) of the Internal Revenue Code of 1986, as amended (the "Code"), and include and clarify several features that promote good governance.        
Increase in share available for grant 437,500        
Shares available for grant   592,369   592,369  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average recognition period       2 years 2 months 12 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       $ 1,200,000  
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average recognition period [1]       1 year 10 months 25 days  
Number of shares range percentage       150.00%  
[1] Represents the target number of shares to be issued for each performance-based award.