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Calculation of Basic and Diluted Net Income (loss) Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic net income per share              
Net income applicable to common stockholders         $ 46,529 $ 105,631 $ 15,042
Undistributed earnings allocated to participating securities         (457) (904) (84)
Net income applicable to common stockholders excluding amounts applicable to participating securities         46,072 104,727 14,958
Weighted average common shares outstanding         68,460 68,325 68,086
Basic net income per share $ 0.15 $ 0.24 $ 0.20 $ 0.08 $ 0.67 $ 1.53 $ 0.22
Diluted net income per share:              
Net income applicable to common stockholders         46,529 105,631 15,042
Undistributed earnings allocated to participating securities         (457) (904) (84)
Net income applicable to common stockholders excluding amounts applicable to participating securities         $ 46,072 $ 104,727 $ 14,958
Weighted average common shares outstanding         68,460 68,325 68,086
Dilutive shares from assumed conversion of convertible senior notes         63 0 0
Dilutive stock options and restricted stock         558 239 332
Diluted weighted average common shares outstanding         69,081 68,564 68,418
Diluted net income per share $ 0.15 [1] $ 0.23 [1] $ 0.20 [1] $ 0.08 [1] $ 0.67 $ 1.53 $ 0.22
[1] Basic and diluted net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net income per share may differ from annual net income per share due to rounding.