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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings per common share:        
Net earnings $ 54,481 $ 35,373 $ 106,123 $ 70,286
Less: Net earnings allocated to restricted stock 134 94 276 202
Net earnings allocated to common shareholders $ 54,347 $ 35,279 $ 105,847 $ 70,084
Weighted average shares outstanding 139,748 109,983 139,682 109,921
Basic earnings per common share $ 0.39 $ 0.32 $ 0.76 $ 0.64
Diluted earnings per common share:        
Net income allocated to common shareholders $ 54,347 $ 35,279 $ 105,847 $ 70,084
Weighted average shares outstanding 139,748 109,983 139,682 109,921
Incremental shares from assumed exercise of outstanding options 149 372 179 418
Diluted weighted average shares outstanding 139,897 110,355 139,861 110,339
Diluted earnings per common share $ 0.39 $ 0.32 $ 0.76 $ 0.64