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Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic net income per share:
Net income applicable to common stockholders	$ 18,947	$ 33,378	$ 62,066	$ 96,433
Weighted average common shares outstanding	58,994	63,604	59,675	64,488
Basic net income per share	$ 0.32	$ 0.52	$ 1.04	$ 1.5
Diluted net income per share:
Net income applicable to common stockholders	$ 18,947	$ 33,378	$ 62,066	$ 96,433
Weighted average common shares outstanding	58,994	63,604	59,675	64,488
Dilutive shares from assumed conversion of convertible senior notes	1,701	1,172	1,713	743
Dilutive stock options and restricted stock	1,540	1,256	1,527	1,222
Diluted weighted average common shares outstanding	62,235	66,032	62,915	66,453
Diluted net income per share	$ 0.3	$ 0.51	$ 0.99	$ 1.45

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- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units 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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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