Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.19.1
Share-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Share-based compensation expense $ 711,000 $ 884,000
Related tax benefits on non-qualified stock options $ 213,000 $ 247,000
Number of shares, stock options exercised (shares) 650  
Stock option awards    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Unrecognized share-based compensation expense $ 0  
Restricted stock awards    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Unrecognized share-based compensation expense $ 3,315,000