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Real Estate Properties - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Feb. 05, 2015
Apr. 09, 2015
Real Estate Properties              
Proceeds from the sale of real estate properties     $ 9,605us-gaap_ProceedsFromSaleOfRealEstate $ 0us-gaap_ProceedsFromSaleOfRealEstate      
Gain on sale of real estate 2,777us-gaap_GainLossOnSaleOfProperties 0us-gaap_GainLossOnSaleOfProperties 2,777us-gaap_GainLossOnSaleOfProperties 0us-gaap_GainLossOnSaleOfProperties      
Corporate Joint Venture [Member] | Houston TX [Member]              
Real Estate Properties              
Interest in joint venture (as a percent)     91.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_StatementGeographicalAxis
= brt_HoustonTXMember
  80.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_StatementGeographicalAxis
= brt_HoustonTXMember
   
Payments to Acquire Interest in Joint Venture     2,036us-gaap_PaymentsToAcquireInterestInJointVenture
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_StatementGeographicalAxis
= brt_HoustonTXMember
       
Corporate Joint Venture [Member] | Decatur, GA [Member]              
Real Estate Properties              
Interest in joint venture (as a percent)     100.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_StatementGeographicalAxis
= brt_DecaturGAMember
  80.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_StatementGeographicalAxis
= brt_DecaturGAMember
   
Payments to Acquire Interest in Joint Venture     1,850us-gaap_PaymentsToAcquireInterestInJointVenture
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_StatementGeographicalAxis
= brt_DecaturGAMember
       
Corporate Joint Venture [Member] | Houston, TX and Decatur, GA [Member]              
Real Estate Properties              
Professional fees 153us-gaap_ProfessionalFees
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_StatementGeographicalAxis
= brt_HoustonTXandDecaturGAMember
           
Apartment Building [Member] | Lawrenceville, GA [Member]              
Real Estate Properties              
Proceeds from the sale of real estate properties           9,700us-gaap_ProceedsFromSaleOfRealEstate
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
/ us-gaap_StatementGeographicalAxis
= brt_LawrencevilleGAMember
 
Gain on sale of real estate           2,654us-gaap_GainLossOnSaleOfProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
/ us-gaap_StatementGeographicalAxis
= brt_LawrencevilleGAMember
 
Noncontrolling Interest [Member] | Apartment Building [Member] | Lawrenceville, GA [Member]              
Real Estate Properties              
Gain on sale of real estate           1,140us-gaap_GainLossOnSaleOfProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
/ us-gaap_StatementGeographicalAxis
= brt_LawrencevilleGAMember
 
Subsequent Event [Member] | Apartment Building [Member] | Corporate Joint Venture [Member] | Houston TX [Member]              
Real Estate Properties              
Proceeds from the sale of real estate properties             39,900us-gaap_ProceedsFromSaleOfRealEstate
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
/ us-gaap_StatementGeographicalAxis
= brt_HoustonTXMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Gain on sale of real estate             $ 5,300us-gaap_GainLossOnSaleOfProperties
/ dei_LegalEntityAxis
= us-gaap_CorporateJointVentureMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ApartmentBuildingMember
/ us-gaap_StatementGeographicalAxis
= brt_HoustonTXMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember