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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
Mar. 31, 2014
Mar. 31, 2013
BASIC EPS:    
Net income $ 34,822 $ 56,230
Adjust for income attributed to holders of non-vested restricted stock (353) (482)
Income attributed to common stockholders 34,469 55,748
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 142,892 144,827
Basic net income per common share $ 0.24 $ 0.38
DILUTED EPS:    
Income attributed to common stockholders $ 34,469 $ 55,748
Weighted average number of common shares outstanding, excluding non-vested shares of restricted stock 142,892 144,827
Add dilutive effect of potential common shares 2,207 1,956
Weighted average number of diluted common shares outstanding 145,099 146,783
Diluted net income per common share $ 0.24 $ 0.38
Potentially dilutive securities excluded as anti-dilutive 80 1,874