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Organization and Background (Details) (Corporate Joint Venture [Member], Property Acquisition [Member], Apartment Building [Member])
 3 Months Ended
Dec. 31, 2014
Minimum [Member]
  
Organization, background and significant accounting policies  
Equity contribution in each transaction (as a percent) 50.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TypeOfArrangementAxis
= brt_PropertyAcquisitionMember
Maximum [Member]
  
Organization, background and significant accounting policies  
Equity contribution in each transaction (as a percent) 90.00%us-gaap_SaleOfStockPercentageOfOwnershipAfterTransaction
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= brt_PropertyAcquisitionMember