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Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic net income per share:        
Net income applicable to common stockholders $ 35,531 $ 28,649 $ 63,055 $ 39,122
Weighted average common shares outstanding 64,834 67,591 64,936 68,158
Basic net income per share $ 0.55 $ 0.42 $ 0.97 $ 0.57
Diluted net income per share:        
Net income applicable to common stockholders $ 35,531 $ 28,649 $ 63,055 $ 39,122
Weighted average common shares outstanding 64,834 67,591 64,936 68,158
Dilutive shares from assumed conversion of convertible senior notes 1,057 2,047 529 1,888
Dilutive stock options and restricted stock 1,224 1,056 1,205 1,076
Diluted weighted average common shares outstanding 67,115 70,694 66,670 71,122
Diluted net income per share $ 0.53 $ 0.41 $ 0.95 $ 0.55