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Dispositions (Details) (USD $)
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1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2011
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Feb. 28, 2009
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Dec. 31, 2010
sqft
Property
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Mar. 31, 2009
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Dec. 31, 2011
Property
sqft
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Dec. 31, 2010
|
Dec. 31, 2009
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Feb. 28, 2009
Japan [Member]
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Mar. 31, 2009
Japan [Member]
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Dec. 31, 2011
Japan [Member]
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Feb. 28, 2009
China [Member]
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Dec. 31, 2010
Shopping centers [Member]
Property
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Dec. 31, 2010
Office Building [Member]
Property
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Dec. 31, 2010
Mixed Use Projects [Member]
Property
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Dec. 31, 2010
Residential development joint ventures [Member]
Property
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| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |||||||||||||||
| Number of properties to be sold | 4 | 2 | 11 | 2 | |||||||||||
| Real estate property disposed (in square feet) | 23,000,000 | 10,700,000 | |||||||||||||
| Total cash consideration | $ 1,300,000,000 | $ 500,000,000 | $ 845,500,000 | ||||||||||||
| Gain recognized on disposition of investment | (3,300,000) | (180,200,000) | |||||||||||||
| Income tax expense related to the transaction | 20,500,000 | ||||||||||||||
| Dispositions (Textual) [Abstract] | |||||||||||||||
| Number of real estate properties disposed | 182 | 94 | |||||||||||||
| Gross proceeds from selling of a portfolio | 1,000,000,000 | 1,020,000,000 | 1,100,000,000 | ||||||||||||
| Net gain achieved | 203,100,000 | 68,100,000 | |||||||||||||
| Loss from continuing operations | 66,100,000 | 9,500,000 | |||||||||||||
| Gain from discontinued operations | 269,200,000 | 58,600,000 | |||||||||||||
| Percentage of ownership interest | 20.00% | 20.00% | |||||||||||||
| Impairment charge | 168,800,000 | 168,800,000 | |||||||||||||
| Gains recognized on property acquisitions and dispositions, net | (111,684,000) | (28,488,000) | (35,262,000) | ||||||||||||
| Resulting gain after completion of transaction | $ 4,400,000 | ||||||||||||||