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Sale of Real Estate Asset and Abandonment of Development Project (Details Textual) $ in Millions	1 Months Ended
	Jun. 30, 2017 USD ($)	May 24, 2017 USD ($)	Apr. 26, 2017 USD ($)	Feb. 22, 2017 USD ($)	Jun. 30, 2018 USD ($)	Nov. 24, 2015 a
Real Estate Assets Held for Development and Sale [Line Items]
Disposition Fees			$ 1.2	$ 1.3
Proceeds from Sale of Real Estate Gross				71.4
Payments for Mortgage on Real Estate Sold				41.4
Proceeds from Sale of Real Estate			24.1	28.6
Gain (Loss) on Disposition of Assets			22.8	16.7
Proceeds from Sale of Property Held-for-sale			82.4
Pro Rata [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Gain (Loss) on Disposition of Assets			16.1
Proceeds from Sale of Property Held-for-sale			$ 19.1
East San Marco Property [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Area of Real Estate Property \| a						44,276
Real Estate Investment Property, Net					$ 2.9
Fox Hill Property [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Disposition Fees		$ 0.5
Proceeds from Sale of Real Estate Gross		46.5
Proceeds from Sale of Real Estate		19.2
Gain (Loss) on Disposition of Assets		10.7
Payment for Debt Extinguishment or Debt Prepayment Cost		1.6
Fox Hill Property [Member] \| Mortgages [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Payments for Mortgage on Real Estate Sold		26.7
Fox Hill Property [Member] \| Pro Rata [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Gain (Loss) on Disposition of Assets		10.3
Proceeds from Sale of Property Held-for-sale		$ 16.4
ARIUM Glenridge [Member]
Real Estate Assets Held for Development and Sale [Line Items]
OwnershipPercentageOnInvestments			90.00%
Bluerock Residential Growth REIT, Inc [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Gain (Loss) on Disposition of Assets				7.8
Proceeds from Sale of Property Held-for-sale				$ 13.6
Lansbrook Village Properties [Member] \| Mortgages [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Payments for Mortgage on Real Estate Sold			$ 57.2
Mda Apartments [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Disposition Fees	$ 0.7
Proceeds from Sale of Real Estate	17.6
Gain (Loss) on Disposition of Assets	6.4
Proceeds from Sale of Property Held-for-sale	$ 18.3
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	35.00%
Gain On Sale Of Equity Interests	$ 10.2
Mda Apartments [Member] \| Pro Rata [Member]
Real Estate Assets Held for Development and Sale [Line Items]
Proceeds from Sale of Property Held-for-sale	$ 11.0