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FAIR VALUE MEASUREMENTS (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 12, 2014 Line of credit | Dec. 31, 2013 Line of credit | Dec. 31, 2013 Recurring Carrying and fair Value | Dec. 31, 2012 Recurring Carrying and fair Value | Dec. 31, 2013 Recurring Carrying and fair Value Interest rate swap | Dec. 31, 2012 Recurring Carrying and fair Value Interest rate swap | Dec. 31, 2013 Recurring Level 1 | Dec. 31, 2012 Recurring Level 1 | Dec. 31, 2013 Recurring Level 2 Interest rate swap | Dec. 31, 2012 Recurring Level 2 Interest rate swap | Dec. 31, 2013 BRT Realty Trust | Dec. 31, 2013 Other equity securities | Dec. 31, 2013 Mortgages payable | Dec. 31, 2012 Mortgages payable
Fair Value of Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of mortgages payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 283,142,000 | $ 233,170,000
Excess of fair value over carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,097,000 | 7,199,000
Blended or estimated market interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 4.80%
Weighted average remaining term of the mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years | 9 years 2 months 12 days
Carrying amount |  |  |  | 12,850,000 | 23,250,000 |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  |  |  | 282,000 | 278,000 |  |  | 282,000 | 278,000 |  |  | 262,000 | 20,000 |  |
Derivative financial instruments |  |  |  |  |  |  |  | 265,000 |  |  |  | 265,000 |  |  |  |  |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |  |  | 774,000 | 1,470,000 |  |  | 774,000 | 1,470,000 |  |  |  |
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 | 144,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross proceeds of available-for-sale securities | 19,000 | 373,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized gain on available-for-sale securities | 6,000 | 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge on available-for-sale securities |  |  | $ 126,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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