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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, 2019
Mar. 31, 2018
Earnings per common share:    
Net earnings $ 51,642 $ 34,913
Less: Net earnings allocated to restricted stock 141 108
Net earnings allocated to common shareholders $ 51,501 $ 34,805
Weighted average shares outstanding 139,615 109,859
Basic earnings per common share $ 0.37 $ 0.32
Diluted earnings per common share:    
Net income allocated to common shareholders $ 51,501 $ 34,805
Weighted average shares outstanding 139,615 109,859
Incremental shares from assumed exercise of outstanding options 216 364
Diluted weighted average shares outstanding 139,831 110,223
Diluted earnings per common share $ 0.37 $ 0.32