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 $)
 0 Months Ended 3 Months Ended 6 Months Ended
Mar. 20, 2013
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Jun. 30, 2013
Jun. 30, 2013
Schedule of Equity Method Investments [Line Items]      
Number of units 828    
Venture property acquisition cost $ 262,500,000    
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   165,000,000 165,000,000
Interest rate   3.17% 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%    
Management, leasing and other services fees   $ 119,000 $ 119,000
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 they receive 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%