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Equity and Earnings Per Share Reconciliation - Earnings Per Common Share Reconciliation (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings per common share:                      
Net earnings $ 22,136 $ 9,257 $ 23,619 $ 22,268 $ 21,712 $ 22,383 $ 21,038 $ 16,600 $ 77,280 $ 81,733 $ 62,935
Less: Net earnings allocated to restricted stock                 247 292 217
Net earnings allocated to common shareholders (numerator)                 77,033 81,441 62,718
Weighted average shares outstanding (denominator)                 104,419 105,143 105,880
Earnings per common share $ 0.21 $ 0.09 $ 0.23 $ 0.21 $ 0.21 $ 0.21 $ 0.20 $ 0.16 $ 0.74 $ 0.77 $ 0.59
Diluted earnings per common share:                      
Net income allocated to common shareholders (numerator)                 $ 77,033 $ 81,441 $ 62,718
Weighted average shares outstanding                 104,419 105,143 105,880
Incremental shares from assumed exercise of outstanding options                 239 80 246
Diluted weighted average shares outstanding (denominator)                 104,658 105,223 106,126
Diluted earnings per common share $ 0.21 $ 0.09 $ 0.23 $ 0.21 $ 0.21 $ 0.21 $ 0.20 $ 0.16 $ 0.74 $ 0.77 $ 0.59