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Earnings Per Share Reconciliation - Schedule of Earnings Per Common Share Reconciliation (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings per common share:      
Net earnings $ 235,425 $ 212,521 $ 177,159
Less: Net earnings allocated to restricted stock 1,508 970 572
Net earnings allocated to common shareholders $ 233,917 $ 211,551 $ 176,587
Weighted average shares outstanding 139,652 135,165 136,031
Basic earnings per common share $ 1.67 $ 1.57 $ 1.30
Diluted earnings per common share:      
Net income allocated to common shareholders $ 233,917 $ 211,551 $ 176,587
Weighted average shares outstanding 139,652 135,165 136,031
Incremental shares from assumed exercise of outstanding options 360 217 175
Diluted weighted average shares outstanding 140,012 135,382 136,206
Diluted earnings per common share $ 1.67 $ 1.56 $ 1.30