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Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Basic net income per share:    
Net income applicable to common stockholders $ 20,173 $ 27,524
Weighted average common shares outstanding 60,143 65,037
Basic net income per share $ 0.34 $ 0.42
Diluted net income per share:    
Net income applicable to common stockholders $ 20,173 $ 27,524
Weighted average common shares outstanding 60,143 65,037
Dilutive shares from assumed conversion of convertible senior notes 1,683 0
Dilutive stock options and restricted stock 1,564 1,187
Diluted weighted average common shares outstanding 63,390 66,224
Diluted net income per share $ 0.32 $ 0.42