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Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Basic net income per share                              
Net income applicable to common stockholders                         $ 104,289 $ 60,930 $ 46,529
Undistributed earnings allocated to participating securities                         0 (481) (457)
Net income applicable to common stockholders excluding amounts applicable to participating securities                         $ 104,289 $ 60,449 $ 46,072
Weighted average common shares outstanding                         67,201 68,895 68,460
Basic net income per share $ 0.50 $ 0.48 $ 0.42 $ 0.15 $ 0.28 $ 0.26 $ 0.23 $ 0.11 $ 0.15 $ 0.24 $ 0.20 $ 0.08 $ 1.55 $ 0.88 $ 0.67
Diluted net income per share:                              
Net income applicable to common stockholders                         $ 104,289 $ 60,930 $ 46,529
Undistributed earnings allocated to participating securities                         0 (481) (457)
Net income applicable to common stockholders excluding amounts applicable to participating securities                         $ 104,289 $ 60,449 $ 46,072
Weighted average common shares outstanding                         67,201 68,895 68,460
Dilutive shares from assumed conversion of convertible senior notes                         1,128 1,354 63
Dilutive stock options and restricted stock                         1,039 814 558
Diluted weighted average common shares outstanding                         69,368 71,063 69,081
Diluted net income per share $ 0.50 [1] $ 0.47 [1] $ 0.41 [1] $ 0.15 [1] $ 0.27 [1] $ 0.25 [1] $ 0.23 [1] $ 0.10 [1] $ 0.15 [1] $ 0.23 [1] $ 0.20 [1] $ 0.08 [1] $ 1.50 $ 0.85 $ 0.67
[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.