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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per common share:                      
Net earnings $ 17,851 $ 29,683 $ 28,373 $ 28,504 $ 27,076 $ 25,448 $ 25,514 $ 23,391 $ 104,411 $ 101,429 $ 99,145
Less: Net earnings allocated to restricted stock                 382 421 515
Net earnings allocated to common shareholders                 $ 104,029 $ 101,008 $ 98,630
Weighted average shares outstanding                 109,409 107,282 105,715
Basic earnings per common share $ 0.16 $ 0.27 $ 0.26 $ 0.26 $ 0.25 $ 0.23 $ 0.23 $ 0.22 $ 0.95 $ 0.94 $ 0.93
Diluted earnings per common share:                      
Net income allocated to common shareholders                 $ 104,029 $ 101,008 $ 98,630
Weighted average shares outstanding                 109,409 107,282 105,715
Incremental shares from assumed exercise of outstanding options                 398 405 477
Diluted weighted average shares outstanding                 109,807 107,687 106,192
Diluted earnings per common share $ 0.16 $ 0.27 $ 0.26 $ 0.26 $ 0.25 $ 0.23 $ 0.23 $ 0.22 $ 0.95 $ 0.94 $ 0.93