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Share-Based Compensation - Activity in Company's Plan - Long Term Incentive Plan (Detail) - Long Term Incentive Plan Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding at January 1, 2021, Number of Shares 50,950    
Granted, Number of Shares 3,000 25,500 5,000
Exercised, Number of Shares (7,000) (5,050) (4,000)
Forfeited, Number of Shares 0    
Outstanding (vested and expected to vest) at December 31, 2021, Number of Shares 46,950    
Exercisable at December 31, 2021, Number of Shares 29,950    
Outstanding at January 1, 2021, Weighted Average Exercise Price per Share $ 54.81    
Granted, Weighted Average Exercise Price per Share 69.89    
Exercised, Weighted Average Exercise Price per Share 47.66    
Outstanding (vested and expected to vest) at December 31, 2021, Weighted Average Exercise Price per Share 56.84    
Exercisable at December 31, 2021, Weighted Average Exercise Price per Share $ 57.39    
Outstanding (vested and expected to vest) at December 31, 2021, Weighted Average Remaining Contractual Term 6 years 4 months 24 days    
Exercisable at December 31, 2021, Weighted Average Remaining Contractual Term 5 years 2 months 12 days    
Outstanding (vested and expected to vest) at December 31, 2021, Aggregate Intrinsic Value $ 454    
Exercisable at December 31, 2021, Aggregate Intrinsic Value $ 325