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Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Basic net income per share:        
Net income applicable to common stockholders $ 22,945 $ 35,531 $ 43,118 $ 63,055
Weighted average common shares outstanding 59,902 64,834 60,022 64,936
Basic net income per share $ 0.38 $ 0.55 $ 0.72 $ 0.97
Diluted net income per share:        
Net income applicable to common stockholders $ 22,945 $ 35,531 $ 43,118 $ 63,055
Weighted average common shares outstanding 59,902 64,834 60,022 64,936
Dilutive shares from assumed conversion of convertible senior notes 1,831 1,057 1,762 529
Dilutive stock options and restricted stock 1,474 1,224 1,519 1,205
Diluted weighted average common shares outstanding 63,207 67,115 63,303 66,670
Diluted net income per share $ 0.36 $ 0.53 $ 0.68 $ 0.95