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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

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