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Property, Plant and Equipment (Depreciation and Amortization) (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
Total depreciation and amortization	$ 7,919	$ 7,729	$ 22,860	$ 21,757
Depreciation and amortization included in income from discontinued operations	(7,902)	(7,710)	(22,807)	(21,660)
Depreciation and amortization included in income from continuing operations	$ 17	$ 19	$ 53	$ 97

The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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