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Organization and Nature of Business (Details Textual) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended
Oct. 08, 2014
Sep. 09, 2013
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jan. 20, 2015
Mar. 28, 2014
Jan. 14, 2015
Organization and Nature of Business [Line Items]                
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest     90.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest   42.20%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest      
Proceeds From Issuance Of Common Stock $ 32,900,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 22,600,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 53,650,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 0us-gaap_ProceedsFromIssuanceOfCommonStock        
Contribution Transactions Completed Description     a series of related contribution transactions pursuant to which it acquired indirect equity interests in four apartment properties, and a 100% fee simple interest in a fifth apartment property for an aggregate asset value of $152.3 million (inclusive of Villas of Oak Crest, which is accounted for under the equity method, and Springhouse, in which the Company already owned an interest and which has been reported as consolidated for the periods presented.          
Number of Units in Real Estate Property     4,131us-gaap_NumberOfUnitsInRealEstateProperty          
Common Class A [Member]                
Organization and Nature of Business [Line Items]                
Proceeds From Issuance Of Common Stock           53,700,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Stock Issued During Period, Shares, New Issues 3,035,444us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
        4,600,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Proceeds from Issuance Initial Public Offering     44,000,000us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
         
Stockholders Equity, Reverse Stock Split     Immediately following the filing of the Second Charter Amendment, we effectuated a 2.264881 to 1 reverse stock split of our outstanding shares of Class B-1 common stock, Class B-2 common stock and Class B-3 common stock, and on March 31, 2014, we effected an additional 1.0045878 to 1 reverse stock split of our outstanding shares of Class B-1 common stock, Class B-2 common stock and Class B-3 common stock.          
Sale of Stock, Price Per Share $ 11.90us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
        $ 12.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  $ 12.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Common Stock, Par or Stated Value Per Share     $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
IPO [Member]                
Organization and Nature of Business [Line Items]                
Stockholders Equity, Reverse Stock Split     Following the filing of the Second Charter Amendment, the Company effected a 2.264881-to-1 reverse stock split of its outstanding shares of Class B-1 common stock, Class B-2 common stock and Class B-3 common stock, and on March 31, 2014, the Company effected an additional 1.0045878-to-1 reverse stock split of its outstanding shares of Class B-1 common stock, Class B-2 common stock and Class B-3 common stock.          
IPO [Member] | Common Class A [Member]                
Organization and Nature of Business [Line Items]                
Stock Issued During Period, Shares, New Issues             3,448,276us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Shares Issued, Price Per Share             $ 14.50us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Proceeds From Issuance Initial Public Offering Gross             $ 50,000,000cik0001442626_ProceedsFromIssuanceInitialPublicOfferingGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
 
Operating Property [Member]                
Organization and Nature of Business [Line Items]                
Percent of Real Estate Properties Occupied     94.00%cik0001442626_PercentOfRealEstatePropertiesOccupied
/ dei_LegalEntityAxis
= cik0001442626_OperatingPropertyMember
         
Operating Units [Member]                
Organization and Nature of Business [Line Items]                
Number of Units in Real Estate Property     3,226us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_LegalEntityAxis
= cik0001442626_OperatingUnitsMember
         
Under Development [Member]                
Organization and Nature of Business [Line Items]                
Number of Units in Real Estate Property     905us-gaap_NumberOfUnitsInRealEstateProperty
/ dei_LegalEntityAxis
= cik0001442626_UnderDevelopmentMember