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SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Jan. 31, 2012
Dec. 31, 2012
item
Dec. 31, 2011
Dec. 31, 2010
Jan. 31, 2012
Class A units
Jan. 03, 2012
Class A units
Aug. 20, 2007
Class A units
Dec. 31, 2012
Minimum
Dec. 31, 2012
Minimum
Cash and cash equivalents
Dec. 31, 2012
Maximum
Dec. 31, 2012
Maximum
Cash and cash equivalents
Dec. 31, 2012
Investment Properties/Joint Venture
item
Dec. 31, 2012
Investment Properties/Joint Venture
Minimum
Dec. 31, 2012
Investment Properties/Joint Venture
Maximum
Principles of Consolidation                            
Ownership interest in each subsidiary (as a percent)               99.67%   100.00%        
Number of limited liability companies                       9    
Percentage of ownership in Joint Ventures                         40.00% 50.00%
Revenue Recognition                            
Period for which arrears are charged against income   60 days                        
Segment Reporting                            
Number of segments   1                        
Income 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              
Concentration of Credit Risks and Financial Instruments                            
Interest rate on interest bearing accounts (as a percent)                 0.01%   0.45%      
Federally uninsured amounts of cash and cash equivalents, and security deposits included in prepaid expenses and other assets   $ 8,000,000 $ 5,051,000                      
Advertising Expense                            
Advertising expense   $ 52,084 $ 88,585 $ 70,074                    
Interest Capitalized                            
Criteria of capitalization of interest on property based on specified period of construction               1 year