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Earnings Per Share Reconciliation - Schedule of Earnings Per Common Share Reconciliation (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings per common share:                      
Net earnings $ 25,288 $ 24,239 $ 24,466 $ 21,615 $ 22,136 $ 9,257 $ 23,619 $ 22,268 $ 95,608 $ 77,280 $ 81,733
Less: Net earnings allocated to restricted stock                 298 247 292
Net earnings allocated to common shareholders                 95,310 77,033 81,441
Weighted average shares outstanding                 104,729 104,419 105,143
Earnings per common share $ 0.24 $ 0.23 $ 0.23 $ 0.21 $ 0.21 $ 0.09 $ 0.23 $ 0.21 $ 0.91 $ 0.74 $ 0.77
Diluted earnings per common share:                      
Net income allocated to common shareholders                 $ 95,310 $ 77,033 $ 81,441
Weighted average shares outstanding                 104,729 104,419 105,143
Incremental shares from assumed exercise of outstanding options                 397 239 80
Diluted weighted average shares outstanding                 105,126 104,658 105,223
Diluted earnings per common share $ 0.24 $ 0.23 $ 0.23 $ 0.21 $ 0.21 $ 0.09 $ 0.23 $ 0.21 $ 0.91 $ 0.74 $ 0.77