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Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Basic net income per share:        
Net income applicable to common stockholders $ 31,880 $ 18,307 $ 71,002 $ 41,842
Undistributed earnings allocated to participating securities 0 (103) 0 (340)
Net income applicable to common stockholders excluding amounts applicable to participating securities $ 31,880 $ 18,204 $ 71,002 $ 41,502
Weighted average common shares outstanding 66,524 68,976 67,608 68,862
Basic net income per share $ 0.48 $ 0.26 $ 1.05 $ 0.60
Diluted net income per share:        
Net income applicable to common stockholders $ 31,880 $ 18,307 $ 71,002 $ 41,842
Undistributed earnings allocated to participating securities 0 (103) 0 (340)
Net income applicable to common stockholders excluding amounts applicable to participating securities $ 31,880 $ 18,204 $ 71,002 $ 41,502
Weighted average common shares outstanding 66,524 68,976 67,608 68,862
Dilutive shares from assumed conversion of convertible senior notes 611 1,949 1,462 1,806
Dilutive stock options and restricted stock 907 994 1,019 855
Diluted weighted average common shares outstanding 68,042 71,919 70,089 71,523
Diluted net income per share $ 0.47 $ 0.25 $ 1.01 $ 0.58