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Discontinued Operations and Disposition of Real Estate and Real Estate Investments - Net Gains on Disposition of Real Estate and Real Estate Investments (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate and Real Estate Investments [Line Items]      
Land sales $ 5,600,000 $ (400,000) $ 1,000,000
Previously deferred gains and other gains and losses on dispositions 300,000 7,500,000 300,000
Net gains on disposition of real estate and real estate investments $ 5,863,000 $ 7,079,000 $ 1,318,000