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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings per common share:        
Net earnings $ 35,373 $ 28,373 $ 70,286 $ 56,877
Less: Net earnings allocated to restricted stock 94 105 202 217
Net earnings allocated to common shareholders $ 35,279 $ 28,268 $ 70,084 $ 56,660
Weighted average shares outstanding 109,983 109,730 109,921 109,039
Basic earnings per common share $ 0.32 $ 0.26 $ 0.64 $ 0.52
Diluted earnings per common share:        
Net income allocated to common shareholders $ 35,279 $ 28,268 $ 70,084 $ 56,660
Weighted average shares outstanding 109,983 109,730 109,921 109,039
Incremental shares from assumed exercise of outstanding options 372 348 418 406
Diluted weighted average shares outstanding 110,355 110,078 110,339 109,445
Diluted earnings per common share $ 0.32 $ 0.26 $ 0.64 $ 0.52