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Calculation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
BASIC EPS:        
Net income $ 74,420 $ 50,806 $ 171,418 $ 240,618
Adjust for income attributed to holders of non-vested restricted stock (808) (462) (1,660) (2,040)
Income attributed to common stockholders 73,612 50,344 169,758 238,578
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 144,446 149,846 144,915 152,570
Basic net income per common share $ 0.51 $ 0.34 $ 1.17 $ 1.56
DILUTED EPS:        
Income attributed to common stockholders 73,612 50,344 169,758 238,578
Add incremental earnings related to potential common shares 5      
Adjusted income attributed to common stockholders $ 73,617 $ 50,344 $ 169,758 $ 238,578
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 144,446 149,846 144,915 152,570
Add dilutive effect of potential common shares 986 676 925 496
Weighted average number of diluted common shares outstanding 145,432 150,522 145,840 153,066
Diluted net income per common share $ 0.51 $ 0.33 $ 1.16 $ 1.56
Potentially dilutive securities excluded as anti-dilutive 2,897 5,538 4,043 5,498