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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic net income per share:
Net income applicable to common stockholders	$ 31,902	$ 22,945	$ 53,174	$ 43,118
Weighted average common shares outstanding	57,879	59,902	57,836	60,022
Basic net income per share	$ 0.55	$ 0.38	$ 0.92	$ 0.72
Diluted net income per share:
Net income applicable to common stockholders	$ 31,902	$ 22,945	$ 53,174	$ 43,118
Weighted average common shares outstanding	57,879	59,902	57,836	60,022
Dilutive shares from assumed conversion of convertible senior notes	435	1,831	1,073	1,762
Dilutive stock options and restricted stock	960	1,474	1,114	1,519
Diluted weighted average common shares outstanding	59,274	63,207	60,023	63,303
Diluted net income per share	$ 0.54	$ 0.36	$ 0.89	$ 0.68

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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