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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
Mar. 31, 2018
Mar. 31, 2017
Basic net income per share:    
Net income applicable to common stockholders $ 21,272 $ 20,173
Weighted average common shares outstanding 57,793 60,143
Basic net income per share $ 0.37 $ 0.34
Diluted net income per share:    
Net income applicable to common stockholders $ 21,272 $ 20,173
Weighted average common shares outstanding 57,793 60,143
Dilutive shares from assumed conversion of convertible senior notes 1,789 1,683
Dilutive stock options and restricted stock 1,268 1,564
Diluted weighted average common shares outstanding 60,850 63,390
Diluted net income per share $ 0.35 $ 0.32