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Investments in Unconsolidated Real Estate Partnerships - (Details 1)
$ in Millions
Dec. 31, 2015
USD ($)
Property
Dec. 31, 2014
USD ($)
Property
Dec. 31, 2013
Property
Schedule of Equity Method Investments [Line Items]      
Aggregate investment in unconsolidated partnerships $ 15.4 $ 16.0  
Excess of equity method investment aggregate cost over share of underlying historical partners deficit $ (0.8) $ 0.4  
Maximum [Member]      
Schedule of Equity Method Investments [Line Items]      
Range of ownership interests in unconsolidated real estate partnerships 67.00%    
Minimum [Member]      
Schedule of Equity Method Investments [Line Items]      
Range of ownership interests in unconsolidated real estate partnerships 40.00%    
Unconsolidated Properties [Member]      
Schedule of Equity Method Investments [Line Items]      
Number of apartment communities | Property 11 11 20