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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings per common share:        
Net earnings $ 41,631 $ 54,481 $ 79,611 $ 106,123
Less: Net earnings allocated to restricted stock 158 134 237 276
Net earnings allocated to common shareholders $ 41,473 $ 54,347 $ 79,374 $ 105,847
Weighted average shares outstanding 134,998 139,748 137,052 139,682
Basic earnings per common share $ 0.31 $ 0.39 $ 0.58 $ 0.76
Diluted earnings per common share:        
Net income allocated to common shareholders $ 41,473 $ 54,347 $ 79,374 $ 105,847
Weighted average shares outstanding 134,998 139,748 137,052 139,682
Incremental shares from assumed exercise of outstanding options 156 149 176 179
Diluted weighted average shares outstanding 135,154 139,897 137,228 139,861
Diluted earnings per common share $ 0.31 $ 0.39 $ 0.58 $ 0.76