SIGNIFICANT ACCOUNTING POLICIES (Details 2)		9 Months Ended
	Jan. 03, 2012	Sep. 30, 2015 USD ($) item shares	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)	Aug. 20, 2007
Principles of Consolidation
Value of equity method investment to discontinued partnership		$ 0
Revenue Recognition
Period for which arrears are charged against income		60 days
Income Taxes
Provision for income taxes		$ 0
Segment Reporting
Number of segments | item		1
Income Per Unit
Dilutive units | shares		0
Concentration of Credit Risks and Financial Instruments
Federally uninsured amounts of cash and cash equivalents, and security deposits included in prepaid expenses and other assets		$ 10,420,000		$ 15,118,000
Advertising Expense
Advertising expense		106,482	$ 79,346
Interest Capitalized
Capitalized interest		$ 0	$ 0
Class A
Income (Loss) Per Depositary Receipt
Forward split of depositary receipts	3
Exchange ratio of depositary receipts for partnership units before adjustment	10
Exchange ratio of depositary receipts for partnership units after adjustment	30
Number of units in each depository receipt	0.03333				0.1
Minimum
Principles of Consolidation
Ownership interest in each subsidiary (as a percent)		99.67%
Interest Capitalized
Criteria of capitalization of interest on property based on specified period of construction		1 year
Minimum | Cash and cash equivalents
Concentration of Credit Risks and Financial Instruments
Interest rate on interest bearing accounts (as a percent)		0.01%
Maximum
Principles of Consolidation
Ownership interest in each subsidiary (as a percent)		100.00%
Maximum | Cash and cash equivalents
Concentration of Credit Risks and Financial Instruments
Interest rate on interest bearing accounts (as a percent)		0.35%
Total
Principles of Consolidation
Number of limited liability companies | item		9
Total | Minimum
Principles of Consolidation
Percentage of ownership in Joint Ventures		40.00%
Total | Maximum
Principles of Consolidation
Percentage of ownership in Joint Ventures		50.00%