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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 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings per common share:                      
Net earnings $ 28,613 $ 27,886 $ 26,813 $ 15,833 $ 25,581 $ 24,295 $ 25,484 $ 28,661 $ 99,145 $ 104,021 $ 95,608
Less: Net earnings allocated to restricted stock                 515 544 298
Net earnings allocated to common shareholders                 $ 98,630 $ 103,477 $ 95,310
Weighted average shares outstanding                 105,715 105,239 104,729
Basic earnings per common share $ 0.27 $ 0.26 $ 0.25 $ 0.15 $ 0.24 $ 0.23 $ 0.24 $ 0.27 $ 0.93 $ 0.98 $ 0.91
Diluted earnings per common share:                      
Net income allocated to common shareholders                 $ 98,630 $ 103,477 $ 95,310
Weighted average shares outstanding                 105,715 105,239 104,729
Incremental shares from assumed exercise of outstanding options                 477 520 397
Diluted weighted average shares outstanding                 106,192 105,759 105,126
Diluted earnings per common share $ 0.27 $ 0.26 $ 0.25 $ 0.15 $ 0.24 $ 0.23 $ 0.24 $ 0.27 $ 0.93 $ 0.98 $ 0.91