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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Earnings per common share:        
Net earnings $ 47,492 $ 50,423 $ 127,103 $ 156,546
Less: Net earnings allocated to restricted stock 175 116 407 390
Net earnings allocated to common shareholders $ 47,317 $ 50,307 $ 126,696 $ 156,156
Weighted average shares outstanding 135,017 139,824 136,369 139,730
Basic earnings per common share $ 0.35 $ 0.36 $ 0.93 $ 1.12
Diluted earnings per common share:        
Net income allocated to common shareholders $ 47,317 $ 50,307 $ 126,696 $ 156,156
Weighted average shares outstanding 135,017 139,824 136,369 139,730
Incremental shares from assumed exercise of outstanding options 167 151 167 217
Diluted weighted average shares outstanding 135,184 139,975 136,536 139,947
Diluted earnings per common share $ 0.35 $ 0.36 $ 0.93 $ 1.12