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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, 2022
Mar. 31, 2021
Earnings per common share:    
Net earnings $ 45,560 $ 63,893
Less: Net earnings allocated to restricted stock 253 309
Net earnings allocated to common shareholders $ 45,307 $ 63,584
Weighted average shares outstanding 144,725 135,175
Basic earnings per common share $ 0.31 $ 0.47
Diluted earnings per common share:    
Net income allocated to common shareholders $ 45,307 $ 63,584
Weighted average shares outstanding 144,725 135,175
Incremental shares from assumed exercise of outstanding options 294 253
Diluted weighted average shares outstanding 145,019 135,428
Diluted earnings per common share $ 0.31 $ 0.47