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
Mar. 20, 2013
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Mar. 31, 2014
Mar. 31, 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%    
Percentage of interest in developable land 50.00%    
Business acquisition, cash paid 30,200,000    
Internal rate of return   9.00%  
Mortgage loans, carrying amount   165,000,000  
Interest rate   3.17%  
Mortgage loan, maturity date   March 2020  
Initial term of interest only payments   5 years  
Mortgage loan, maturity period   30 years  
Management, leasing and other services fees   $ 108,000 $ 0
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%