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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
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
BASIC EPS:    
Income from continuing operations $ 97,274 $ 71,619
Adjust for income attributed to holders of non-vested restricted stock (742) (501)
Income from continuing operations attributed to common stockholders 96,532 71,118
Loss from discontinued operations, net   (367)
Adjust for loss attributed to holders of non-vested restricted stock   3
Loss from discontinued operations attributed to common stockholders   (364)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 154,625 153,122
Basic income from continuing operations per common share $ 0.62 $ 0.46
Basic loss from discontinued operations per common share $ 0.00 $ 0.00
Basic net income per common share $ 0.62 $ 0.46
DILUTED EPS:    
Income from continuing operations attributed to common stockholders 96,532 71,118
Add incremental earnings related to potential common shares   4
Adjusted income from continuing operations attributed to common stockholders $ 96,532 $ 71,122
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 154,625 153,122
Add dilutive effect of potential common shares 776 1,531
Weighted average number of diluted common shares outstanding 155,401 154,653
Diluted income from continuing operations per common share $ 0.62 $ 0.46
Diluted loss from discontinued operations per common share $ 0.00 $ 0.00
Diluted net income per common share $ 0.62 $ 0.46
Potentially dilutive securities excluded as anti-dilutive 3,229 725