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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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings per common share:        
Net earnings $ 25,448 $ 27,886 $ 74,353 $ 70,532
Less: Net earnings allocated to restricted stock 98 149 305 371
Net earnings allocated to common shareholders $ 25,350 $ 27,737 $ 74,048 $ 70,161
Weighted average shares outstanding 108,984 105,783 107,144 105,672
Basic earnings per common share $ 0.23 $ 0.26 $ 0.69 $ 0.66
Diluted earnings per common share:        
Net income allocated to common shareholders $ 25,350 $ 27,737 $ 74,048 $ 70,161
Weighted average shares outstanding 108,984 105,783 107,144 105,672
Incremental shares from assumed exercise of outstanding options 386 498 403 467
Diluted weighted average shares outstanding 109,370 106,281 107,547 106,139
Diluted earnings per common share $ 0.23 $ 0.26 $ 0.69 $ 0.66