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Fair Value Measurements (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2013 | Aug. 01, 2014 Line of credit | Jun. 30, 2014 Line of credit | Dec. 31, 2013 Line of credit | Jun. 30, 2014 Recurring Carrying and fair Value | Dec. 31, 2013 Recurring Carrying and fair Value | Jun. 30, 2014 Recurring Carrying and fair Value Interest rate swap | Dec. 31, 2013 Recurring Carrying and fair Value Interest rate swap | Jun. 30, 2014 Recurring Level 1 | Dec. 31, 2013 Recurring Level 1 | Jun. 30, 2014 Recurring Level 2 Interest rate swap | Dec. 31, 2013 Recurring Level 2 Interest rate swap | Jun. 30, 2014 Other equity securities | May 31, 2014 BRT Realty Trust Gould Investors L.P | Jun. 30, 2014 Mortgages payable | Dec. 31, 2013 Mortgages payable
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 289,447,000 | $ 283,142,000
Excess of fair value over carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,074,000 | 5,097,000
Blended or estimated market interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.80% | 5.00%
Weighted average remaining term of the mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years 2 months 12 days | 9 years
Carrying amount |  |  |  | 35,450,000 | 36,850,000 | 23,250,000 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  |  |  |  | 25,000 | 282,000 |  |  | 25,000 | 282,000 |  |  | 25,200 |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  | 112,000 | 265,000 |  |  | 112,000 | 265,000 |  |  |  |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  |  | 2,206,000 | 774,000 |  |  | 2,206,000 | 774,000 |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cost of available-for-sale securities | 5,300 | 5,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on available-for-sale securities | 19,900 | 19,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares sold to related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,081 |  |
Proceeds from shares sold to related party |  | 266,000 | 19,000 |  |  |  |  |  |  |  |  |  |  |  |  | 266,000 |  |
Period based on which average of the closing prices considered for proceeds from related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |
Cost of shares sold to related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132,000 |  |
Gain on sale shares sold to related party | 134,000 | 134,000 | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  | 134,000 |  |
Gain reclassified from accumulated other comprehensive loss on the balance sheet into earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 132,000 |  |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
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- Definition Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e689-108580 + Details
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