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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings per common share:        
Net earnings $ 49,753 $ 47,492 $ 164,825 $ 127,103
Less: Net earnings allocated to restricted stock 227 175 773 407
Net earnings allocated to common shareholders $ 49,526 $ 47,317 $ 164,052 $ 126,696
Weighted average shares outstanding 135,200 135,017 135,226 136,369
Basic earnings per common share $ 0.37 $ 0.35 $ 1.21 $ 0.93
Diluted earnings per common share:        
Net income allocated to common shareholders $ 49,526 $ 47,317 $ 164,052 $ 126,696
Weighted average shares outstanding 135,200 135,017 135,226 136,369
Incremental shares from assumed exercise of outstanding options 184 167 215 167
Diluted weighted average shares outstanding 135,384 135,184 135,441 136,536
Diluted earnings per common share $ 0.37 $ 0.35 $ 1.21 $ 0.93