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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings per common share:                      
Net earnings $ 27,076 $ 25,448 $ 25,514 $ 23,391 $ 28,613 $ 27,886 $ 26,813 $ 15,833 $ 101,429 $ 99,145 $ 104,021
Less: Net earnings allocated to restricted stock                 421 515 544
Net earnings allocated to common shareholders                 $ 101,008 $ 98,630 $ 103,477
Weighted average shares outstanding                 107,282 105,715 105,239
Basic earnings per common share $ 0.25 $ 0.23 $ 0.23 $ 0.22 $ 0.27 $ 0.26 $ 0.25 $ 0.15 $ 0.94 $ 0.93 $ 0.98
Diluted earnings per common share:                      
Net income allocated to common shareholders                 $ 101,008 $ 98,630 $ 103,477
Weighted average shares outstanding                 107,282 105,715 105,239
Incremental shares from assumed exercise of outstanding options                 405 477 520
Diluted weighted average shares outstanding                 107,687 106,192 105,759
Diluted earnings per common share $ 0.25 $ 0.23 $ 0.23 $ 0.22 $ 0.27 $ 0.26 $ 0.25 $ 0.15 $ 0.94 $ 0.93 $ 0.98