XML 70 R57.htm IDEA: XBRL DOCUMENT v3.21.2
Share-Based Compensation - Share-Based Compensation Amounts Included in Net Income (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation expense $ 1,439 $ 1,266 $ 3,315 $ 2,322  
Less: tax benefit (384) (331) (885) (607)  
Share-Based Compensation amounts included in net income 1,055 935 $ 2,430 1,715  
Awards to non-employee directors [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     683    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 117.11    
Total compensation expense $ 192 181 $ 380 357  
Award to key employees [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 194,107   194,107   186,878
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     66,612    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     53,147    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period     (852)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 94.61   $ 94.61   $ 87.06
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     102.73    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     76.31    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expirations Weighted Average Grant Date Fair Value     $ 74.85    
Total compensation expense $ 1,247 $ 1,085 $ 2,935 $ 1,965