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Investment in Real Estate - Summary Regarding Industrial Properties Included in Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Real Estate Investment Property, Net [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 10,955 | $ 21,649 | $ 32,079
Property Expenses |  |  |  |  |  |  |  |  | (4,450) | (8,879) | (12,947)
Impairment of Real Estate |  |  |  |  |  |  |  |  | (1,605) | (1,438) | (6,214)
Depreciation and Amortization |  |  |  |  |  |  |  |  | (3,647) | (7,834) | (8,505)
Interest Expense |  |  |  |  |  |  |  |  | 0 | 0 | (63)
Gain on Sale of Real Estate |  |  |  |  |  |  |  |  | 34,344 | 12,665 | 20,419
Provision for Income Taxes |  |  |  |  |  |  |  |  | 0 | 0 | (1,246)
Income from Discontinued Operations | $ 19,323 | $ 5,919 | $ 12,639 | $ (2,284) | $ 1,164 | $ 5,869 | $ 3,141 | $ 5,989 | $ 35,597 | $ 16,163 | $ 23,523

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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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