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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
Mar. 31, 2016
Mar. 31, 2015
Earnings per common share:    
Net earnings $ 23,391 $ 15,833
Less: Net earnings allocated to restricted stock 104 81
Net earnings allocated to common shareholders $ 23,287 $ 15,752
Weighted average shares outstanding 106,392 105,523
Basic earnings per common share $ 0.22 $ 0.15
Diluted earnings per common share:    
Net income allocated to common shareholders $ 23,287 $ 15,752
Weighted average shares outstanding 106,392 105,523
Incremental shares from assumed exercise of outstanding options 392 436
Diluted weighted average shares outstanding 106,784 105,959
Diluted earnings per common share $ 0.22 $ 0.15