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Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Basic net income per share:
Net income applicable to common stockholders	$ 1,942	$ 3,302	$ 7,006	$ 6,499
Undistributed earnings allocated to participating securities	(16)	(19)	(60)	(37)
Net income applicable to common stockholders excluding amounts applicable to participating securities	1,926	3,283	6,946	6,462
Weighted average common shares outstanding	68,323	68,087	68,284	68,048
Basic net income per share	$ 0.03	$ 0.05	$ 0.10	$ 0.09
Diluted net income per share:
Net income applicable to common stockholders	1,942	3,302	7,006	6,499
Undistributed earnings allocated to participating securities	(16)	(19)	(60)	(37)
Net income applicable to common stockholders excluding amounts applicable to participating securities	$ 1,926	$ 3,283	$ 6,946	$ 6,462
Weighted average common shares outstanding	68,323	68,087	68,284	68,048
Dilutive stock options and restricted stock	202	357	287	429
Diluted weighted average common shares outstanding	68,525	68,444	68,571	68,477
Diluted net income per share	$ 0.03	$ 0.05	$ 0.10	$ 0.09

X

- 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 share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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