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Share-Based Compensation - Share-Based Compensation Amounts Included in Net Income (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation expense $ 1,332 $ 1,210 $ 3,654 $ 2,305  
Less: tax benefit (348) (315) (955) (600)  
Share-Based Compensation amounts included in net income 984 895 $ 2,699 1,705  
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     887    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 84.47    
Total compensation expense $ 188 158 $ 545 463  
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 186,209   186,209   157,817
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     69,345    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period     35,651    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expired In Period     (5,302)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 86.98   $ 86.98   $ 80.28
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     92.78    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value     66.48    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expirations Weighted Average Grant Date Fair Value     $ 65.32    
Total compensation expense $ 1,144 $ 1,052 $ 3,109 $ 1,842