Significant Accounting Policy (Details) ft² in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) ft² aptunits	Dec. 31, 2014 USD ($)
Real Estate Properties [Line Items]
Development and construction in progress	$ 40,189	$ 75,289
Rego Park II [Member] | Property Under Development [Member] | Apartment Tower [Member]
Real Estate Properties [Line Items]
Number of units in real estate property (in units) | aptunits	312
Area of property (in square feet) | ft²	255
Estimated Budgeted Cost	$ 125,000
Development and construction in progress	$ 113,000
Estimated Date Of Completion	Fourth quarter of 2015