This element represents Prepayment Premium on secured loan, including the percentage and payment requirements.

No definition available.

Name:	brg_PercentageOfPrepaymentPremium
Namespace Prefix:	brg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

the element represents Percentage Of Unpaid Outstanding Principal Balance.

+ References

No definition available.

+ Details

Name:	brg_PercentageOfUnpaidOutstandingPrincipalBalance
Namespace Prefix:	brg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

+ Details

Name:	us-gaap_DebtInstrumentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of long-term debt arrangements, which are debt arrangements that originally require full repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer, and disclosures pertaining to the underlying arrangements, including repayment terms, conversion features, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements. Types of long-term debt arrangements include borrowing under notes payable, bonds payable, debentures, term loans, and other contractual obligations for payment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

+ Details

Name:	us-gaap_LongTermDebtDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of real estate investments, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; (7) other real estate investments; (8) real estate joint ventures; and (9) unconsolidated real estate and other joint ventures not separately presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_RealEstateInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

+ Details

Name:	us-gaap_SecuredLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_SpringHouseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_MdaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_EndersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_LoansPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=brg_SupplementalLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_VillageGreenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_LansbrookMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	brg_MortgagePayableAxis=brg_InitialAdvanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	brg_MortgagePayableAxis=brg_AdditionalBorrowingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_GrandeLakesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_NorthParkTowersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_ParkKingstonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_FoxHillsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_AriumPalmsMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_AshtonICharlotteNcMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_SorrelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=brg_SovereignMember
Namespace Prefix:
Data Type:	na
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Period Type:

- Details

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Period Type:

- Details

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Mortgages Payable (Details Textual) - USD ($)								1 Months Ended									12 Months Ended
Mortgages Payable (Details Textual) - USD ($)	Dec. 14, 2015	Apr. 07, 2015	Nov. 04, 2014	Sep. 10, 2014	Oct. 02, 2012	Sep. 12, 2012	Dec. 03, 2009	Oct. 29, 2015	Aug. 20, 2015	Aug. 19, 2015	May. 20, 2015	Mar. 26, 2015	Mar. 16, 2015	Mar. 21, 2014	Dec. 24, 2013	Dec. 17, 2012	Dec. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent																	$ 42,000,000
Debt Instrument, Description of Variable Rate Basis		base rate plus 1.25% or LIBOR plus 2.25%.									LIBOR plus 2.0%.
Real Estate Investments, Net, Total																	$ 533,383,000	$ 288,411,000
Spring House [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent							$ 23,400,000
Debt Instrument, Maturity Date							Jan. 01, 2020
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																	5.66%
Percentage Of Prepayment Premium							1.00%
Mda [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent																$ 37,600,000
Debt Instrument, Maturity Date																Jan. 01, 2023
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																5.35%
Percentage Of Prepayment Premium																1.00%
Debt Instrument, Periodic Payment, Principal																$ 209,964
Enders [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent					$ 17,500,000
Debt Instrument, Maturity Date				Nov. 01, 2022	Nov. 01, 2022
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate					3.97%
Percentage Of Prepayment Premium					1.00%
Debt Instrument, Periodic Payment, Principal					$ 83,245
Enders [Member] \| Loans Payable [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount																	$ 17,200,000
Debt Instrument, Interest Rate, Stated Percentage																	3.97%
Enders [Member] \| Supplemental Loan [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount																	$ 8,000,000
Debt Instrument, Interest Rate, Stated Percentage																	5.01%
Secured Long-term Debt, Noncurrent				$ 8,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate				5.01%
Percentage Of Prepayment Premium				1.00%
Debt Instrument, Periodic Payment, Principal				$ 42,995
Village Green [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent						$ 43,200,000
Debt Instrument, Maturity Date						Oct. 01, 2022
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate						3.92%
Percentage Of Prepayment Premium						1.00%
Debt Instrument, Periodic Payment, Principal						$ 204,256
Lansbrook [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																	3.38%
Secured Long-term Debt, Noncurrent														$ 48,000,000
Debt Instrument, Maturity Date														Mar. 31, 2018
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																	4.45%
Debt Instrument, Description of Variable Rate Basis																	three-month LIBOR plus 3.00%
Debt Instrument, Fee Amount														$ 240,000
Lansbrook [Member] \| Initial Advance [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent														42,000,000
Lansbrook [Member] \| Additional borrowing [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent														$ 6,000,000
Lansbrook [Member] \| Supplemental Loan [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent																	$ 1,600,000
ARIUM Grandewood [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent			$ 29,440,000
Debt Instrument, Maturity Date			Dec. 01, 2024
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																	5.00%
Percentage Of Prepayment Premium			1.00%
Debt Instrument, Description of Variable Rate Basis																	bears interest at a floating rate of LIBOR plus 1.67%, with interest-only payments due for the entire loan term
North Park Towers [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent															$ 11,500,000
Debt Instrument, Maturity Date															Jan. 06, 2024
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate															5.65%
Percentage Of Unpaid Outstanding Principal Balance															4.00%
Park Kingston [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent													$ 15,250,000
Debt Instrument, Maturity Date													Apr. 01, 2020
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate													3.21%
Percentage Of Prepayment Premium													1.00%
Fox Hills [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent												$ 26,700,000
Debt Instrument, Maturity Date												Apr. 01, 2022
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate												3.57%
Percentage Of Prepayment Premium												0.00%
Long-term Debt, Description																	During the first 60 months of the term, the loan may be prepaid at any time with at least 30 business days prior notice and the payment of a prepayment premium equal to the greater of (i) 1% of the principal balance and (ii) a yield maintenance amount calculated as set forth in the loan agreement. After the first 60 months of the term through the fourth month prior to the end of the term, the loan may be prepaid at any time with at least 30 business days prior notice and the payment of a prepayment premium equal to 1% of the principal balance, and thereafter, the loan may be prepaid at any time at par. The loan is nonrecourse to the Company and the Fox Hill Borrower with recourse carve-outs for certain deeds, acts or failures to act on the part of the Company and the Fox Hill Borrower, or any of its officers, members, managers or employees.
ARIUM Palms [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent									$ 25,000,000
Debt Instrument, Maturity Date									Sep. 01, 2022
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate									2.22%
Percentage Of Prepayment Premium									1.00%
Debt Instrument, Description of Variable Rate Basis																	loan bears interest at a floating rate of 2.22% plus one-month LIBOR
Ashton I Charlotte, NC [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent										$ 31,900,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate										4.67%
Percentage Of Prepayment Premium										1.00%
Sorrel [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																	2.53%
Secured Long-term Debt, Noncurrent								$ 38,700,000
Debt Instrument, Maturity Date								May 01, 2023
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate								2.29%
Percentage Of Prepayment Premium								1.00%
Debt Instrument, Description of Variable Rate Basis																	loan bears interest at a floating rate of 2.29% plus one-month LIBOR
Sovereign [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent								$ 28,900,000
Debt Instrument, Maturity Date								Nov. 10, 2022
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate								3.46%
Percentage Of Prepayment Premium								1.00%
Ashton II [Member]
Line of Credit Facility [Line Items]
Secured Long-term Debt, Noncurrent	$ 15,300,000
Debt Instrument, Maturity Date	Jan. 01, 2026
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	2.62%
Percentage Of Prepayment Premium	1.00%																5.00%
Debt Instrument, Description of Variable Rate Basis																	loan bears interest at a floating rate of 2.62% plus one-month LIBOR
Ashton I [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Maturity Date										Dec. 01, 2025