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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, 2018
Mar. 31, 2017
Earnings per common share:    
Net earnings $ 34,913 $ 28,504
Less: Net earnings allocated to restricted stock 108 112
Net earnings allocated to common shareholders $ 34,805 $ 28,392
Weighted average shares outstanding 109,859 108,339
Basic earnings per common share $ 0.32 $ 0.26
Diluted earnings per common share:    
Net income allocated to common shareholders $ 34,805 $ 28,392
Weighted average shares outstanding 109,859 108,339
Incremental shares from assumed exercise of outstanding options 364 467
Diluted weighted average shares outstanding 110,223 108,806
Diluted earnings per common share $ 0.32 $ 0.26