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Calculatation of Income Per Share From Continuing and Discontinued Operations (Detail) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
BASIC EPS:
Income from continuing operations	$ 81,928	$ 29,374	$ 235,185	$ 63,088
Adjust for income attributed to holders of non-vested restricted stock	(705)	(224)	(1,841)	(476)
Income from continuing operations attributed to common stockholders	81,223	29,150	233,344	62,612
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	152,617	152,933	153,661	152,682
Basic income from continuing operations per common share	$ 0.53	$ 0.19	$ 1.52	$ 0.41
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	$ 1.52	$ 0.41
DILUTED EPS:
Income from continuing operations attributed to common stockholders	81,223	29,150	233,344	62,612
Add incremental earnings related to potential common shares	6	1
Adjusted income from continuing operations attributed to common stockholders	$ 81,229	$ 29,151	$ 233,344	$ 62,612
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock	152,617	152,933	153,661	152,682
Add dilutive effect of potential common shares	1,503	1,176	1,708
Weighted average number of diluted common shares outstanding	154,120	154,109	155,369	152,682
Diluted income from continuing operations per common share	$ 0.53	$ 0.19	$ 1.50	$ 0.41
Diluted loss from discontinued operations per common share	$ 0.00	$ 0.00	$ 0.00	$ 0.00
Diluted net income per common share	$ 0.53	$ 0.19	$ 1.50	$ 0.41
Potentially dilutive securities excluded as anti-dilutive	410	4,644	1,707	6,726

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