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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings per common share:        
Net earnings $ 64,639 $ 49,753 $ 169,257 $ 164,825
Less: Net earnings allocated to restricted stock 434 227 1,080 773
Net earnings allocated to common shareholders $ 64,205 $ 49,526 $ 168,177 $ 164,052
Weighted average shares outstanding 138,888 135,200 139,923 135,226
Basic earnings per common share $ 0.46 $ 0.37 $ 1.20 $ 1.21
Diluted earnings per common share:        
Net income allocated to common shareholders $ 64,205 $ 49,526 $ 168,177 $ 164,052
Weighted average shares outstanding 138,888 135,200 139,923 135,226
Incremental shares from assumed exercise of outstanding options 459 184 300 215
Diluted weighted average shares outstanding 139,347 135,384 140,223 135,441
Diluted earnings per common share $ 0.46 $ 0.37 $ 1.20 $ 1.21