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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
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Earnings per common share:    
Net earnings $ 59,270 $ 45,560
Less: Net earnings allocated to restricted stock 407 253
Net earnings allocated to common shareholders $ 58,863 $ 45,307
Weighted average shares outstanding 138,592 144,725
Basic earnings per common share $ 0.42 $ 0.31
Diluted earnings per common share:    
Net income allocated to common shareholders $ 58,863 $ 45,307
Weighted average shares outstanding 138,592 144,725
Incremental shares from assumed exercise of outstanding options 361 294
Diluted weighted average shares outstanding 138,953 145,019
Diluted earnings per common share $ 0.42 $ 0.31