Acquisition of Real Estate (Details1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Business Acquisition [Line Items]
Revenues	$ 9,036	$ 3,226
Net income (loss)	9,347	(1,188)
Net income (loss) attributable to BRG	3,313	(1,047)
Scenario, Previously Reported [Member]
Business Acquisition [Line Items]
Revenues	9,036	3,226
Net income (loss)	9,347	(1,188)
Net income (loss) attributable to BRG	3,313	(1,047)
Earnings (loss) per share, basic and diluted	$ 0.26	$ (0.99)
Scenario, Adjustment [Member]
Business Acquisition [Line Items]
Revenues	936	6,314
Net income (loss)	433	(1,170)
Net income (loss) attributable to BRG	412	(1,076)
Pro Forma [Member]
Business Acquisition [Line Items]
Revenues	9,972	9,540
Net income (loss)	9,780	(2,358)
Net income (loss) attributable to BRG	$ 3,725	$ (2,123)
Earnings (loss) per share, basic and diluted	$ 0.30	$ (2.00)