Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (EPS) - Summary of Earnings Per Share (EPS) (Detail)

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Earnings Per Share (EPS) - Summary of Earnings Per Share (EPS) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Earnings Per Share [Abstract]        
Net income $ 8,281 $ 20,083 $ 8,873 $ 46,475
Basic EPS, shares 119,483,780 117,410,212 119,177,431 117,129,364
Basic EPS $ 0.07 $ 0.17 $ 0.07 $ 0.40
Stock options and restricted stock, shares 2,376,231 1,116,667 2,320,792 1,493,673
Stock Options And Restricted Stock, Per Share   $ 0.00   $ (0.01)
Stock options and restricted stock, per share amount $ 0.00   $ 0.00  
Diluted EPS, shares 121,860,011 118,526,879 121,498,223 118,623,037
Diluted EPS $ 0.07 $ 0.17 $ 0.07 $ 0.39