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Calculation of Income (Loss) Per Share From Continuing and Discontinued Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
BASIC EPS:      
Income (loss) from continuing operations $ 322,780 $ 117,898 $ (33,960)
Adjust for (income) loss attributed to holders of non-vested restricted stock (2,545) (884) 313
Income (loss) from continuing operations attributed to common stockholders 320,235 117,014 (33,647)
Loss from discontinued operations, net (367) (956) (4,330)
Adjust for loss attributed to holders of non-vested restricted stock 3 7 38
Loss from discontinued operations attributed to common stockholders (364) (949) (4,292)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 153,871 152,772 152,069
Basic income (loss) from continuing operations per common share $ 2.08 $ 0.77 $ (0.22)
Basic loss from discontinued operations per common share $ 0.00 $ (0.01) $ (0.03)
Basic net income (loss) per common share $ 2.08 $ 0.76 $ (0.25)
DILUTED EPS:      
Income (loss) from continuing operations attributed to common stockholders 320,235 117,014 (33,647)
Add incremental earnings related to potential common shares         
Adjusted income (loss) from continuing operations attributed to common stockholders $ 320,235 $ 117,014 $ (33,647)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 153,871 152,772 152,069
Add dilutive effect of potential common shares 1,433 504  
Weighted average number of diluted common shares outstanding 155,304 153,276 152,069
Diluted income (loss) from continuing operations per common share $ 2.06 $ 0.76 $ (0.22)
Diluted loss from discontinued operations per common share $ 0.00 $ (0.01) $ (0.03)
Diluted net income (loss) per common share $ 2.06 $ 0.76 $ (0.25)
Potentially dilutive securities excluded as anti-dilutive 1,641 4,164 8,090