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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
Mar. 31, 2014
Mar. 31, 2013
Earnings per common share:    
Net earnings $ 28,661 $ 21,615
Less: Net earnings allocated to restricted stock 127 69
Net earnings allocated to common shareholders 28,534 21,546
Weighted average shares outstanding 105,192 104,564
Earnings per common share $ 0.27 $ 0.21
Diluted earnings per common share:    
Net income allocated to common shareholders $ 28,534 $ 21,546
Weighted average shares outstanding 105,192 104,564
Incremental shares from assumed exercise of outstanding options 599 246
Diluted weighted average shares outstanding 105,791 104,810
Diluted earnings per common share $ 0.27 $ 0.21