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Capital Stock - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Mar. 12, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Dividend declaration date May 15, 2019          
Quarterly dividend declared     $ 0.17 $ 0.17 $ 0.17  
Stock repurchase program, authorized amount           $ 10,000,000
Treasury Stock Repurchase (in shares)     0 0 0  
Total intrinsic value of stock options exercised     $ 361,000 $ 2,071,000 $ 1,848,000  
Unrecognized stock option compensation cost     $ 1,000,000      
Weighted-average per share grant date fair value of stock options granted     $ 4.47 $ 6.37 $ 5.43  
Stock compensation expense     $ 4,135,000 $ 3,390,000 $ 2,942,000  
Stock compensation expense, stock option     700,000 1,100,000 1,400,000  
Stock compensation expense, Performance based and restricted share     $ 3,400,000 $ 2,300,000 1,500,000  
Stock compensation expense, stock awards granted         $ 32,000  
Preferred stock Series A            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred stock, shares authorized     100 100    
Preferred stock, issued     0 0    
Preferred stock, outstanding     0 0    
Preferred stock Series B            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Preferred stock, shares authorized     2,000,000 2,000,000    
Preferred stock, issued     0 0    
Preferred stock, outstanding     0 0    
Long Term Incentive Plan 2000            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for grant     946,109      
Share based compensation arrangement by share based payment award, number of shares available for grant increase (decrease)   900,000        
Long Term Incentive Plan 2000 | After Amendment            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for grant     6,187,500      
Stock Options | Minimum | Long Term Incentive Plan 2000            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options expiration period     5 years      
Stock Options | Maximum | Long Term Incentive Plan 2000            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options expiration period     10 years      
Vesting period     4 years      
Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Weighted-average recognition period     1 year 7 months 6 days      
Total fair value of restricted stock vested     $ 1,100,000      
Number of shares vested     90,926 69,795 46,306  
Restricted Stock | Maximum | Long Term Incentive Plan 2000            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     4 years      
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     3 years      
Weighted-average recognition period [1]     1 year 8 months 12 days      
Total fair value of restricted stock vested     $ 792,000      
Number of shares range percentage     150.00%      
Number of shares vested [1]     58,888      
Performance Shares | Long Term Incentive Plan 2000            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period     3 years      
Performance Shares | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares vested 66,761          
Dividend Declared | Subsequent Event            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Quarterly dividend declared $ 0.0425          
Dividend declared, date of record May 01, 2019          
[1] Represents the target number of shares to be issued for each performance-based award.