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Stock-Based Compensation and Stock Awards - Stock Options - Additional Information (Detail)
12 Months Ended
May 13, 2004
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
May 12, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved (up to) (in shares)   224,087 280,212    
Granted (in shares)   0      
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Intrinsic value of stock options exercised | $   $ 700,000 $ 400,000 $ 1,000,000  
Income tax benefit realized from stock options exercised | $   $ 157,442 $ 153,759 $ 357,000  
Anti-dilutive awards (in shares)   6,180 21,000 0  
Stock-based compensation expense for stock option exercises | $   $ 0 $ 0 $ 0  
Capitalized expense | $   0 $ 0 $ 0  
Unrecognized compensation expense related to share based compensation | $   $ 0      
2004 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cumulative annual increments of the total number of shares 0.25        
2004 Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved (up to) (in shares) 2,696,294        
Options granted period   10 years      
Vesting period (in years) 4 years        
2017 Plan | Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved (up to) (in shares)         1,500,000
Granted (in shares)   0