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Discontinued Operations - Operating Results Relating to Assets Sold or Designated as Held for Sale (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Discontinued Operations And Disposal Groups [Abstract]
Revenues	$ 777	$ 6,157
Operating expenses	0	2,943
Impairment charges	753	15,830
Interest, net	106	1,367
Depreciation and amortization	209	1,817
Total expenses	1,068	21,957
Loss from discontinued operations	(291)	(15,800)
Gain on disposition of real estate, net of tax	601	70
Income (loss) from discontinued operations	$ 310	$ (15,730)

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