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Stock-Based Compensation (Components of Stock-Based Compensation) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total stock-based compensation	$ 393	$ 1,039	$ 1,536	$ 3,175
Stock-based compensation included in income from discontinued operations	(41)	(368)	(194)	(1,213)
Stock-based compensation included in income from continuing operations	$ 352	$ 671	$ 1,342	$ 1,962

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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