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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings per common share:        
Net earnings $ 51,179 $ 41,631 $ 115,072 $ 79,611
Less: Net earnings allocated to restricted stock 239 158 547 237
Net earnings allocated to common shareholders $ 50,940 $ 41,473 $ 114,525 $ 79,374
Weighted average shares outstanding 135,286 134,998 135,235 137,052
Basic earnings per common share $ 0.38 $ 0.31 $ 0.85 $ 0.58
Diluted earnings per common share:        
Net income allocated to common shareholders $ 50,940 $ 41,473 $ 114,525 $ 79,374
Weighted average shares outstanding 135,286 134,998 135,235 137,052
Incremental shares from assumed exercise of outstanding options 221 156 235 176
Diluted weighted average shares outstanding 135,507 135,154 135,470 137,228
Diluted earnings per common share $ 0.38 $ 0.31 $ 0.85 $ 0.58