Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Crystal House Apartments Investors LLC) (Narrative) (Details)

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Investments In Unconsolidated Joint Ventures (Crystal House Apartments Investors LLC) (Narrative) (Details) (Crystal House Apartments Investors LLC [Member], USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended
Mar. 20, 2013
item
Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Number of units 828  
Venture property acquisition cost $ 262.5  
Number of units available for development 295  
Number of approved units available for development 252  
Percentage of interest in venture 25.00%  
Internal rate of return   9.00%
Mortgage loans, carrying amount   $ 165.0
Interest rate   3.17%
Mortgage loan, maturity date   March 2020
Initial term of interest only payments   5 years
Amortization schedule   30 years
Percentage of interest in developable land 50.00%  
Holding and distribution pattern under operating agreement   In general, the operating agreement of CHAI provides that net operating cash flows are distributed to the members in accordance with ownership percentages. Net cash flows from a capital event are distributed first to the members in accordance with ownership percentages until UBS receives a nine percent IRR, as defined, with any excess distributed 50 percent to the Company and 50 percent to UBS.
Parent Company [Member]
    
Schedule of Equity Method Investments [Line Items]    
Percentage of capital event cash flows distributed   50.00%
UBS Global Asset Management [Member]
    
Schedule of Equity Method Investments [Line Items]    
Percentage of capital event cash flows distributed   50.00%