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Summary Regarding Industrial Properties Included in Discontinued Operations (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
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Total Revenues $ 1,778 $ 4,271 $ 7,121 $ 14,394
Property Expenses (635) (1,640) (2,852) (5,838)
Impairment of Real Estate   (1,387) (1,411) (4,828)
Depreciation and Amortization (137) (1,150) (1,263) (3,320)
Interest Expense       (63)
Gain on Sale of Real Estate 4,420 6,010 12,005 13,351
Provision for Income Taxes       (2,048)
Income from Discontinued Operations $ 5,426 $ 6,104 $ 13,600 $ 11,648