Calculatation of Income Per Share From Continuing and Discontinued Operations (Detail) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
BASIC EPS:
Income from continuing operations	$ 81,638	$ 29,528	$ 153,257	$ 33,714
Adjust for income attributed to holders of non-vested restricted stock	(648)	(232)	(1,145)	(254)
Income from continuing operations attributed to common stockholders	80,990	29,296	152,112	33,460
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	153,556	152,650	153,340	152,554
Basic income from continuing operations per common share	$ 0.53	$ 0.19	$ 0.99	$ 0.22
Basic loss from discontinued operations per common share	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Basic net income per common share	$ 0.53	$ 0.19	$ 0.99	$ 0.22
DILUTED EPS:
Income from continuing operations attributed to common stockholders	80,990	29,296	152,112	33,460
Add incremental earnings related to potential common shares	8
Adjusted income from continuing operations attributed to common stockholders	$ 80,998	$ 29,296	$ 152,112	$ 33,460
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	153,556	152,650	153,340	152,554
Add dilutive effect of potential common shares	2,025	221	1,912	298
Weighted average number of diluted common shares outstanding	155,581	152,871	155,252	152,852
Diluted income from continuing operations per common share	$ 0.52	$ 0.19	$ 0.98	$ 0.22
Diluted loss from discontinued operations per common share	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Diluted net income per common share	$ 0.52	$ 0.19	$ 0.98	$ 0.22
Potentially dilutive securities excluded as anti-dilutive	380	6,907	1,796	6,907

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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