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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, 2012
Dec. 31, 2011
Dec. 31, 2010
BASIC EPS:      
Income from continuing operations $ 299,477 $ 322,780 $ 117,898
Adjust for income attributed to holders of non-vested restricted stock (2,532) (2,545) (884)
Income from continuing operations attributed to common stockholders 296,945 320,235 117,014
Loss from discontinued operations, net    (367) (956)
Adjust for loss attributed to holders of non-vested restricted stock   3 7
Loss from discontinued operations attributed to common stockholders   (364) (949)
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 151,144 153,871 152,772
Basic income from continuing operations per common share $ 1.96 $ 2.08 $ 0.77
Basic loss from discontinued operations per common share $ 0.00 $ 0.00 $ (0.01)
Basic net income per common share $ 1.96 $ 2.08 $ 0.76
DILUTED EPS:      
Income from continuing operations attributed to common stockholders 296,945 320,235 117,014
Add incremental earnings related to potential common shares         
Adjusted income from continuing operations attributed to common stockholders $ 296,945 $ 320,235 $ 117,014
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 151,144 153,871 152,772
Add dilutive effect of potential common shares 555 1,433 504
Weighted average number of diluted common shares outstanding 151,699 155,304 153,276
Diluted income from continuing operations per common share $ 1.96 $ 2.06 $ 0.76
Diluted loss from discontinued operations per common share $ 0.00 $ 0.00 $ (0.01)
Diluted net income per common share $ 1.96 $ 2.06 $ 0.76
Potentially dilutive securities excluded as anti-dilutive 5,416 1,641 4,164