Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (EPS) (Detail)

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Earnings Per Share (EPS) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
EPS,income $ 10,936 $ 20,725 $ 57,411 $ 39,727
Basic EPS,shares 118,109,214 116,416,011 117,458,365 115,899,959
Basic EPS $ 0.09 $ 0.18 $ 0.49 $ 0.34
Stock options and restricted stock 1,091,805 1,009,753 1,351,830 1,012,408
Stock options and restricted stock Per-Share Amount $ (0.01)   $ (0.01)  
Diluted EPS, shares 119,201,019 117,425,764 118,810,195 116,912,367
Diluted EPS $ 0.09 $ 0.18 $ 0.48 $ 0.34