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Business Segments (Details Textual) (USD $)
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3 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
Investment
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Mar. 31, 2011
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Dec. 31, 2010
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Sep. 30, 2010
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Jun. 30, 2010
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Mar. 31, 2010
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Dec. 31, 2011
Segments
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Dec. 31, 2010
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Dec. 31, 2009
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | $ 484,132,000 | $ 488,641,000 | $ 327,235,000 | $ 233,283,000 | $ 236,223,000 | $ 222,944,000 | $ 213,606,000 | $ 211,814,000 | $ 1,533,291,000 | $ 884,587,000 | $ 1,027,171,000 |
| Number of investments in property funds | 2 | ||||||||||
| Impairment Charges | 97,000,000 | 21,237,000 | 736,612,000 | 331,592,000 | |||||||
| Impairment of goodwill | 368,451,000 | ||||||||||
| Business Segments (Textual) [Abstract] | |||||||||||
| Number of reportable segments | 2 | ||||||||||
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Private capital [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 137,619,000 | 122,526,000 | 144,963,000 | ||||||||
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Direct owned [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 1,395,672,000 | 762,061,000 | 701,971,000 | ||||||||
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Real estate operations segment [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Assets held for sale | 444,900,000 | 554,200,000 | 444,900,000 | 554,200,000 | |||||||
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Americas [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Assets held for sale | 20,600,000 | 20,600,000 | |||||||||
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Americas [Member] | Private capital [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 76,872,000 | 66,653,000 | 67,964,000 | ||||||||
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Americas [Member] | Direct owned [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 890,135,000 | 587,911,000 | 594,365,000 | ||||||||
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Americas [Member] | Real estate operations segment [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Assets held for sale | 79,100,000 | 470,500,000 | 79,100,000 | 470,500,000 | |||||||
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Europe [Member] | Private capital [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 46,087,000 | 54,835,000 | 50,814,000 | ||||||||
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Europe [Member] | Direct owned [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 344,249,000 | 91,458,000 | 62,477,000 | ||||||||
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Europe [Member] | Real estate operations segment [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Assets held for sale | 332,500,000 | 18,200,000 | 332,500,000 | 18,200,000 | |||||||
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Asia [Member] | Private capital [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 14,660,000 | 1,038,000 | 26,185,000 | ||||||||
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Asia [Member] | Direct owned [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 161,288,000 | 82,692,000 | 45,129,000 | ||||||||
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Asia [Member] | Real estate operations segment [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Assets held for sale | 33,300,000 | 65,500,000 | 33,300,000 | 65,500,000 | |||||||
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North America [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Impairment of goodwill | 235,500,000 | ||||||||||
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U.S. [Member]
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| Segment Reporting Information [Line Items] | |||||||||||
| Total revenues | 891,100,000 | 611,400,000 | 588,300,000 | ||||||||
| Long-lived assets attributable to the United States | $ 11,800,000,000 | $ 8,600,000,000 | $ 11,800,000,000 | $ 8,600,000,000 | |||||||