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Computation of Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic net income per share:
Net income applicable to common stockholders	$ 7,296	$ 5,735
Undistributed earnings allocated to participating securities	(61)	(51)
Net income applicable to common stockholders excluding amounts applicable to participating securities	7,235	5,684
Weighted average common shares outstanding	68,669	68,395
Basic net income per share	$ 0.11	$ 0.08
Diluted net income per share:
Net income applicable to common stockholders	7,296	5,735
Undistributed earnings allocated to participating securities	(61)	(51)
Net income applicable to common stockholders excluding amounts applicable to participating securities	$ 7,235	$ 5,684
Weighted average common shares outstanding	68,669	68,395
Dilutive shares from assumed conversion of convertible senior notes	1,591	0
Dilutive stock options and restricted stock	828	433
Diluted weighted average common shares outstanding	71,088	68,828
Diluted net income per share	$ 0.10	$ 0.08

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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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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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