Acquisitions and Dispositions - Schedule of Property Acquisitions (Details) | Jun. 29, 2017USD ($)property_unit | Jun. 02, 2017USD ($)aproperty_unit | Apr. 04, 2017USD ($)property_unit | Feb. 28, 2017USD ($)property_unit | Nov. 04, 2016USD ($)property_unit | May 31, 2016USD ($)property_unit | May 11, 2016USD ($)property_unit | May 06, 2016USD ($)property_unit | Feb. 29, 2016USD ($)property_unit | Feb. 01, 2016USD ($)property_unit | Jan. 22, 2016USD ($)property_unit | Nov. 18, 2015USD ($)property_unit | Oct. 13, 2015USD ($)aproperty_unit | Jun. 30, 2017USD ($)property_unit | Jun. 30, 2016USD ($)property_unit | Jun. 30, 2017USD ($)property_unit | Jun. 30, 2016USD ($)property_unit |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | | | | | | | | 9,890 | | 9,890 | |
Capitalized Acquisition Costs | | | | | | | | | | | | | | $ 0 | $ 1,408,000 | $ 0 | $ 2,418,000 |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | | | | | | | | 1,486 | 2,393 | 1,486 | 2,393 |
Purchase Price | | | | | | | | | | | | | | $ 204,016,000 | $ 205,350,000 | $ 204,016,000 | $ 205,350,000 |
Initial BRT Equity | | | | | | | | | | | | | | | | 47,131,000 | 49,006,000 |
Capitalized Acquisition Costs | | | | | | | | | | | | | | | | 2,761,000 | 2,418,000 |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | | | | | | | | | $ 140,300,000 | $ 153,273,000 | $ 140,300,000 | $ 153,273,000 |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Fredricksburg, VA | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | 220 | | | | | | | | | | | | |
Purchase Price | | | | | $ 38,490,000 | | | | | | | | | | | | |
Initial BRT Equity | | | | | $ 8,720,000 | | | | | | | | | | | | |
Ownership Percentage | | | | | 80.00% | | | | | | | | | | | | |
Capitalized Acquisition Costs | | | | | $ 643,000 | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Fredricksburg, VA | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | $ 29,900,000 | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | St. Louis, MO | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | 53 | | | | | | | | | | | | | |
Purchase Price | | | | $ 8,000,000 | | | | | | | | | | | | | |
Initial BRT Equity | | | | $ 2,002,000 | | | | | | | | | | | | | |
Ownership Percentage | | | | 75.50% | | | | | | | | | | | | | |
Capitalized Acquisition Costs | | | | $ 134,000 | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | St. Louis, MO | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | $ 6,200,000 | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | St. Louis, MO (Location 2) | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | 128 | | | | | | | | | | | | | |
Purchase Price | | | | $ 27,000,000 | | | | | | | | | | | | | |
Initial BRT Equity | | | | $ 6,001,000 | | | | | | | | | | | | | |
Ownership Percentage | | | | 75.50% | | | | | | | | | | | | | |
Capitalized Acquisition Costs | | | | $ 423,000 | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | St. Louis, MO (Location 2) | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | $ 20,000,000 | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Creve Coeur, MO | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | 174 | | | | | | | | | | | | | | |
Purchase Price | | | $ 39,600,000 | | | | | | | | | | | | | | |
Initial BRT Equity | | | $ 9,408,000 | | | | | | | | | | | | | | |
Ownership Percentage | | | 78.00% | | | | | | | | | | | | | | |
Capitalized Acquisition Costs | | | $ 569,000 | | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Creve Coeur, MO | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | $ 29,000,000 | | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | West Nashville, TN | Multi-family | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Area of land | a | | | | | | | | | | | | | 41.5 | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | West Nashville, TN | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | 402 | | | | | | | | | | | | | | | |
Purchase Price | | $ 5,228,000 | | | | | | | | | | | | | | | |
Initial BRT Equity | | $ 4,800,000 | | | | | | | | | | | | | | | |
Ownership Percentage | | 58.00% | | | | | | | | | | | | | | | |
Capitalized Acquisition Costs | | $ 0 | | | | | | | | | | | | | | | |
Area of land | a | | 44 | | | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | West Nashville, TN | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | $ 0 | | | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Farmers Branch, TX | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | 509 | | | | | | | | | | | | | | | | |
Purchase Price | $ 85,698,000 | | | | | | | | | | | | | | | | |
Initial BRT Equity | $ 16,200,000 | | | | | | | | | | | | | | | | |
Ownership Percentage | 50.00% | | | | | | | | | | | | | | | | |
Capitalized Acquisition Costs | $ 992,000 | | | | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Farmers Branch, TX | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | $ 55,200,000 | | | | | | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | N. Charleston, SC | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | | | | | | | 271 | | | | |
Purchase Price | | | | | | | | | | | | | $ 3,625,000 | | | | |
Initial BRT Equity | | | | | | | | | | | | | $ 6,558,000 | | | | |
Ownership Percentage | | | | | | | | | | | | | 65.00% | | | | |
Capitalized Acquisition Costs | | | | | | | | | | | | | $ 0 | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | N. Charleston, SC | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | | | | | | | | $ 0 | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | La Grange, GA | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | | | | | | 236 | | | | | |
Purchase Price | | | | | | | | | | | | $ 22,800,000 | | | | | |
Initial BRT Equity | | | | | | | | | | | | $ 6,824,000 | | | | | |
Ownership Percentage | | | | | | | | | | | | 100.00% | | | | | |
Capitalized Acquisition Costs | | | | | | | | | | | | $ 57,000 | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | La Grange, GA | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | | | | | | | $ 16,051,000 | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Katy, TX | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | | | | | 268 | | | | | | |
Purchase Price | | | | | | | | | | | $ 40,250,000 | | | | | | |
Initial BRT Equity | | | | | | | | | | | $ 8,150,000 | | | | | | |
Ownership Percentage | | | | | | | | | | | 75.00% | | | | | | |
Capitalized Acquisition Costs | | | | | | | | | | | $ 382,000 | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Katy, TX | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | | | | | | $ 30,750,000 | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Macon, GA | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | | | | 240 | | | | | | | |
Purchase Price | | | | | | | | | | $ 14,525,000 | | | | | | | |
Initial BRT Equity | | | | | | | | | | $ 3,250,000 | | | | | | | |
Ownership Percentage | | | | | | | | | | 80.00% | | | | | | | |
Capitalized Acquisition Costs | | | | | | | | | | $ 158,000 | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Macon, GA | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | | | | | $ 11,200,000 | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Southaven, MS | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | | | 392 | | | | | | | | |
Purchase Price | | | | | | | | | $ 35,000,000 | | | | | | | | |
Initial BRT Equity | | | | | | | | | $ 5,856,000 | | | | | | | | |
Ownership Percentage | | | | | | | | | 60.00% | | | | | | | | |
Capitalized Acquisition Costs | | | | | | | | | $ 413,000 | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Southaven, MS | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | | | | $ 28,000,000 | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | San Antonio, TX | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | | 288 | | | | | | | | | |
Purchase Price | | | | | | | | $ 35,150,000 | | | | | | | | | |
Initial BRT Equity | | | | | | | | $ 6,688,000 | | | | | | | | | |
Ownership Percentage | | | | | | | | 65.00% | | | | | | | | | |
Capitalized Acquisition Costs | | | | | | | | $ 539,000 | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | San Antonio, TX | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | | | $ 26,400,000 | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Dallas, TX | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | | 494 | | | | | | | | | | |
Purchase Price | | | | | | | $ 37,000,000 | | | | | | | | | | |
Initial BRT Equity | | | | | | | $ 6,750,000 | | | | | | | | | | |
Ownership Percentage | | | | | | | 50.00% | | | | | | | | | | |
Capitalized Acquisition Costs | | | | | | | $ 567,000 | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Dallas, TX | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | | $ 27,938,000 | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Columbia, SC | Multi-family | Property Acquisition | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
No. of Units | property_unit | | | | | | 204 | | | | | | | | | | | |
Purchase Price | | | | | | $ 17,000,000 | | | | | | | | | | | |
Initial BRT Equity | | | | | | $ 4,930,000 | | | | | | | | | | | |
Ownership Percentage | | | | | | 80.00% | | | | | | | | | | | |
Capitalized Acquisition Costs | | | | | | $ 302,000 | | | | | | | | | | | |
Corporate Joint Venture | Variable Interest Entity, Primary Beneficiary | Columbia, SC | Multi-family | Property Acquisition | Mortgages | | | | | | | | | | | | | | | | | |
Real Estate Properties | | | | | | | | | | | | | | | | | |
Acquisition Mortgage Debt | | | | | | $ 12,934,000 | | | | | | | | | | | |