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Capital Stock - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Mar. 08, 2018
Mar. 07, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Apr. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock repurchase program, authorized amount             $ 10,000,000
Treasury Stock Repurchase (in shares)       0 0 0  
Total intrinsic value of stock options exercised       $ 2,071,000 $ 1,848,000 $ 639,000  
Unrecognized stock option compensation cost       $ 1,000,000      
Weighted-average per share grant date fair value of stock options granted       $ 6.37 $ 5.43 $ 4.68  
Stock compensation expense       $ 3,390,000 $ 2,942,000 $ 5,286,000  
Stock compensation expense, stock option       1,100,000 1,400,000 2,200,000  
Stock compensation expense, Performance based and restricted share       $ 2,300,000 1,500,000 800,000  
Stock compensation expense, stock awards granted         $ 32,000 $ 2,200,000  
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       619,369      
Share based compensation arrangement by share based payment award, number of shares available for grant increase (decrease)     437,500        
Long Term Incentive Plan 2000 | After Amendment              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares available for grant       5,287,500      
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted-average recognition period       2 years 1 month 6 days      
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       2 years 7 months 6 days      
Total fair value of restricted stock vested       $ 1,300,000      
Number of shares vested       69,795 46,306 24,649  
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      
Number of shares range percentage       150.00%      
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   58,888          
Dividend Declared | Subsequent Event              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Dividend declaration date Mar. 08, 2018            
Quarterly dividend declared $ 0.0425            
Dividend payable date May 15, 2018            
Dividend declared, date of record May 01, 2018            
[1] Represents the target number of shares to be issued for each performance-based award.