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Fair Value Measurements (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Available-for-sale securities
Aggregate cost of available-for-sale securities	$ 138,000
Unrealized gain on available-for-sale securities	142,000
Recurring | Carrying and fair Value
Available-for-sale securities:
Equity securities	280,000	278,000
Derivative financial instruments	140,000
Financial liabilities:
Derivative financial instruments	702,000	1,470,000
Recurring | Level 1
Available-for-sale securities:
Equity securities	280,000	278,000
Recurring | Level 2
Available-for-sale securities:
Derivative financial instruments	140,000
Financial liabilities:
Derivative financial instruments	702,000	1,470,000
BRT Realty Trust
Available-for-sale securities:
Equity securities	260,000
Other equity securities
Available-for-sale securities:
Equity securities	20,000
Mortgages payable
Fair Value of Financial Instruments
Estimated fair value of mortgages payable	235,825,000	233,170,000
Excess of fair value over carrying value	$ 7,972,000	$ 7,199,000
Blended or estimated market interest rate (as a percent)	4.50%	4.80%
Weighted average remaining term of the mortgages	8 years 7 months 6 days	9 years 2 months 12 days

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