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Earnings Per Share - Calculations of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Earnings Per Share Calculations Of Basic And Diluted Earnings Per Share [Abstract]                      
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent                 $ 83,467 $ 70,642 $ 61,100
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax                   $ 856 $ 4,053
Income (Loss) from Continuing Operations, Per Basic Share                 $ 4.75 $ 4.23 $ 3.73
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share                 $ 0 $ 0.05 $ 0.24
Calculation of Basic Earnings Per Share:                      
Net Income $ 22,352 $ 9,261 $ 10,956 $ 28,930 $ 22,564 $ 5,621 $ 8,304 $ 28,663 $ 83,466 $ 71,498 $ 65,153
Weighted shares outstanding - Basic (in shares)                 17,558,078 16,711,579 16,398,443
Basic Earnings Per Share (in usd per share) $ 1.27 $ 0.56 $ 0.67 $ 1.76 $ 1.38 $ 0.34 $ 0.51 $ 1.75 $ 4.75 $ 4.28 $ 3.97
Calculation of Diluted Earnings Per Share:                      
Net Income $ 22,352 $ 9,261 $ 10,956 $ 28,930 $ 22,564 $ 5,621 $ 8,304 $ 28,663 $ 83,466 $ 71,498 $ 65,153
Reconciliation of Denominator:                      
Weighted shares outstanding - Basic (in shares)                 17,558,078 16,711,579 16,398,443
Share-based Compensation                 74,951 59,156 50,043
Adjusted denominator — Diluted                 17,633,029 16,770,735 16,448,486
Income (Loss) from Continuing Operations, Per Diluted Share                 $ 4.73 $ 4.21 $ 3.72
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Per Diluted Share                 0 0.05 0.24
Diluted (in usd per share) $ 1.26 $ 0.56 $ 0.66 $ 1.76 $ 1.37 $ 0.34 $ 0.50 $ 1.74 $ 4.73 $ 4.26 $ 3.96