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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings per common share:        
Net earnings $ 27,886 $ 24,295 $ 70,532 $ 78,440
Less: Net earnings allocated to restricted stock 149 134 371 409
Net earnings allocated to common shareholders $ 27,737 $ 24,161 $ 70,161 $ 78,031
Weighted average shares outstanding 105,783 104,875 105,672 105,218
Basic earnings per common share $ 0.26 $ 0.23 $ 0.66 $ 0.74
Diluted earnings per common share:        
Net income allocated to common shareholders $ 27,737 $ 24,161 $ 70,161 $ 78,031
Weighted average shares outstanding 105,783 104,875 105,672 105,218
Incremental shares from assumed exercise of outstanding options 498 531 467 542
Diluted weighted average shares outstanding 106,281 105,406 106,139 105,760
Diluted earnings per common share $ 0.26 $ 0.23 $ 0.66 $ 0.74