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Commitments and Contingencies (Details Textual)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Long-term Purchase Commitment [Line Items]  
Long-term construction loan commitment $ 114.0
Undrawn portion of long term construction loans 48.5
Contract to purchase apartment community currently under construction 320.0
Commitments related to development, redevelopment and capital improvement activities [Member]  
Long-term Purchase Commitment [Line Items]  
Commitments related to capital spending activities $ 114.8
Time Period of Long-term Purchase Commitment 12 months
Minimum [Member]  
Long-term Purchase Commitment [Line Items]  
Compliance Period For Low Income Housing Tax Credit Syndication Agreements 1 year
Maximum [Member]  
Long-term Purchase Commitment [Line Items]  
Compliance Period For Low Income Housing Tax Credit Syndication Agreements 11 years
Maximum [Member] | Commitments related to operations [Member]  
Long-term Purchase Commitment [Line Items]  
Time Period of Long-term Purchase Commitment 1 year