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Fair Value Measurements (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
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Mar. 31, 2014 | May 31, 2014 Line of credit | Mar. 31, 2014 Line of credit | Dec. 31, 2013 Line of credit | Mar. 31, 2014 Recurring Carrying and fair Value | Dec. 31, 2013 Recurring Carrying and fair Value | Mar. 31, 2014 Recurring Carrying and fair Value Interest rate swap | Dec. 31, 2013 Recurring Carrying and fair Value Interest rate swap | Mar. 31, 2014 Recurring Level 1 | Dec. 31, 2013 Recurring Level 1 | Mar. 31, 2014 Recurring Level 2 Interest rate swap | Dec. 31, 2013 Recurring Level 2 Interest rate swap | Mar. 31, 2014 BRT Realty Trust | Mar. 31, 2014 Other equity securities | Mar. 31, 2014 Mortgages payable | Dec. 31, 2013 Mortgages payable
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 289,624,000 | $ 283,142,000
Excess of fair value over carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,721,000 | 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 4 months 24 days | 9 years
Carrying amount |  | 12,850,000 | 12,850,000 | 23,250,000 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  |  | 287,000 | 282,000 |  |  | 287,000 | 282,000 |  |  | 264,000 | 23,000 |  |
Derivative financial instruments |  |  |  |  |  |  | 214,000 | 265,000 |  |  | 214,000 | 265,000 |  |  |  |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  | 1,441,000 | 774,000 |  |  | 1,441,000 | 774,000 |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in available-for-sale equity securities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 37,081 |  |  |
Aggregate cost of available-for-sale securities | 138,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gain on available-for-sale securities | $ 149,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition Represents the amount of difference between the fair value and carrying value. + References No definition available. + Details
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- Definition Represents the weighted average remaining term of the mortgages based on which the market interest rate is assumed. + References No definition available. + Details
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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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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 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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