Real Estate Properties (Details 2) (USD $) | 3 Months Ended | 9 Months Ended | | 0 Months Ended | | 0 Months Ended | | 0 Months Ended | | 0 Months Ended | | 0 Months Ended | | 0 Months Ended | | 0 Months Ended | | 0 Months Ended | | 0 Months Ended | | 0 Months Ended | | 1 Months Ended | | 0 Months Ended | 3 Months Ended | | 9 Months Ended | | 9 Months Ended | 12 Months Ended | | 0 Months Ended | | 9 Months Ended | |
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Sep. 30, 2013 | Oct. 04, 2013 | Oct. 04, 2013 | Oct. 04, 2013 | Oct. 15, 2013 | Oct. 15, 2013 | Oct. 15, 2013 | Oct. 15, 2013 | Oct. 15, 2013 | Oct. 15, 2013 | Oct. 15, 2013 | Oct. 15, 2013 | Oct. 15, 2013 | Oct. 18, 2013 | Oct. 18, 2013 | Oct. 18, 2013 | Jan. 21, 2014 | Jan. 21, 2014 | Jan. 21, 2014 | Apr. 02, 2014 | Apr. 02, 2014 | Apr. 02, 2014 | Apr. 02, 2014 | Apr. 02, 2014 | Apr. 02, 2014 | Apr. 02, 2014 | Apr. 02, 2014 | Apr. 02, 2014 | Jun. 26, 2014 | Jun. 26, 2014 | Jun. 26, 2014 | Jul. 31, 2014 | Jul. 31, 2014 | Jan. 14, 2014 | Jan. 14, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 | Nov. 21, 2013 | Nov. 21, 2013 | Nov. 21, 2013 | Jun. 30, 2014 | Jun. 30, 2014 |
Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary Aggregated Disclosure [Member] | R B H T R B Newark Holdings L L C [Member] | R B H T R B Newark Holdings L L C [Member] | R B H T R B Newark Holdings L L C [Member] | R B H T R B Newark Holdings L L C [Member] | Subsidiaries [Member] | Subsidiaries [Member] | Subsidiaries [Member] | Affiliated Entity [Member] | Affiliated Entity [Member] |
Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Development [Member] | Property Development [Member] | Property Development [Member] | Property Acquisition [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Variable Interest Entity Primary Beneficiary [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] | Property Acquisition [Member] |
Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Land [Member] | Land [Member] | Greenville South Carolina [Member] | Apartment Building [Member] | Retail Site [Member] | Apartment Building [Member] | Commercial Mixed Use Property [Member] | Commercial Mixed Use Property [Member] | Commercial Mixed Use Property [Member] | Commercial Mixed Use Property [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] | Apartment Building [Member] |
Houston T X Location1 [Member] | Houston T X Location1 [Member] | Houston T X Location1 [Member] | Pasadena T X [Member] | Pasadena T X [Member] | Pasadena T X [Member] | Humble T X Location One [Member] | Humble T X Location One [Member] | Humble T X Location One [Member] | Humble T X Location Two [Member] | Humble T X Location Two [Member] | Humble T X Location Two [Member] | Huntsville A L [Member] | Huntsville A L [Member] | Huntsville A L [Member] | Indianapolis I N [Member] | Indianapolis I N [Member] | Indianapolis I N [Member] | Nashville T N [Member] | Nashville T N [Member] | Nashville T N [Member] | Little Rock A K [Member] | Little Rock A K [Member] | Little Rock A K [Member] | Wichita K S Location One [Member] | Wichita K S Location One [Member] | Wichita K S Location One [Member] | Atlanta G A [Member] | Atlanta G A [Member] | Atlanta G A [Member] | Houston T X Location2 [Member] | Houston T X Location2 [Member] | Greenville South Carolina [Member] | Greenville South Carolina [Member] | | Greenville South Carolina [Member] | Greenville South Carolina [Member] | Other Locations Of Real Estate Properties [Member] | item | Newark N J [Member] | Newark N J [Member] | Newark N J [Member] | Columbus O H [Member] | Columbus O H [Member] | Columbus O H [Member] | item | Mortgages [Member] |
| property | Mortgages [Member] | | property | Mortgages [Member] | | item | Mortgages [Member] | | item | Mortgages [Member] | | item | Mortgages [Member] | | item | Mortgages [Member] | | item | Mortgages [Member] | | item | Mortgages [Member] | | item | Mortgages [Member] | | item | Mortgages [Member] | home | Mortgages [Member] | | | | home | sqft | | | sqft | | Mortgages [Member] | | item | Mortgages [Member] | | |
Real Estate Properties | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Interest in joint venture (as a percent) | ' | ' | ' | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 80.00% | ' | ' | 74.40% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Number of Units | ' | ' | ' | ' | ' | ' | 798 | ' | ' | 144 | ' | ' | 260 | ' | ' | 160 | ' | ' | 208 | ' | ' | 400 | ' | ' | 300 | ' | ' | 172 | ' | ' | 496 | ' | ' | 350 | ' | 272 | ' | ' | ' | ' | 360 | ' | ' | 3 | ' | ' | ' | ' | 264 | ' | 3,552 | ' |
Contract Purchase Price | ' | ' | ' | ' | ' | ' | $32,800,000 | ' | ' | $5,420,000 | ' | ' | $10,500,000 | ' | ' | $6,700,000 | ' | ' | $12,050,000 | ' | ' | $18,800,000 | ' | ' | $26,750,000 | ' | ' | $6,750,000 | ' | ' | $20,750,000 | ' | ' | $28,350,000 | ' | $15,300,000 | ' | ' | $7,000,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | $14,050,000 | ' | $189,920,000 | ' |
Acquisition Debt | ' | ' | ' | ' | ' | ' | ' | 24,100,000 | ' | ' | 4,065,000 | ' | ' | 7,875,000 | ' | ' | 5,025,000 | ' | ' | 9,573,000 | ' | ' | 14,500,000 | ' | ' | 17,300,000 | ' | ' | 4,101,000 | ' | ' | 13,863,000 | ' | ' | 22,165,000 | ' | 11,500,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 10,651,000 | ' | 133,218,000 |
Initial BRT Equity / additional investment | ' | ' | ' | ' | ' | 10,525,000 | ' | ' | 1,687,000 | ' | ' | 3,129,000 | ' | ' | 1,908,000 | ' | ' | 3,950,000 | ' | ' | 5,300,000 | ' | ' | 8,420,000 | ' | ' | ' | ' | ' | 6,932,000 | ' | ' | 5,944,000 | ' | ' | 5,100,000 | ' | 6,400,000 | ' | 3,231,000 | ' | ' | ' | ' | 4,972,000 | 1,729,000 | ' | ' | ' | ' | ' | ' |
BRT Equity | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 2,372,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 3,734,000 | ' | ' | 60,301,000 | ' |
Property Acquisition Costs | 718,000 | 851,000 | 2,246,000 | 1,916,000 | ' | 474,000 | ' | ' | 125,000 | ' | ' | 180,000 | ' | ' | 129,000 | ' | ' | 202,000 | ' | ' | 191,000 | ' | ' | 296,000 | ' | ' | 117,000 | ' | ' | 155,000 | ' | ' | 189,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | 91,000 | ' | ' | ' | ' | 97,000 | ' | ' | 2,246,000 | ' |
Amount invested in joint ventue | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 9,631,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Area of real estate properties (in square feet) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 690,000 | ' | ' | ' | ' | ' | ' | ' |
Area of real estate property under construction (in square feet) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 10,000 | ' | ' | 190,000 | ' | ' | ' | ' | ' | ' | ' |
Aggregate principal of related party mortgage | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 20,100,000 | ' | ' | ' | ' | ' |
Mortgages | $451,655,000 | ' | $451,655,000 | ' | $313,216,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | $80,425,000 | ' | ' | ' | ' | ' | ' | ' |