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SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)
 1 Months Ended 6 Months Ended 58 Months Ended 1 Months Ended 6 Months Ended 58 Months Ended 6 Months Ended 58 Months Ended 1 Months Ended 6 Months Ended 58 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended
Jan. 31, 2012
Jun. 30, 2012
item
Jun. 30, 2011
Jun. 30, 2012
Dec. 31, 2011
Aug. 31, 2012
Subsequent event
Jan. 31, 2012
Class A units
Jun. 30, 2012
Class A units
Jun. 30, 2012
Class A units
Jan. 03, 2012
Class A units
Jun. 30, 2012
Class B Units
Jun. 30, 2012
Class B Units
Aug. 31, 2012
Class B Units
Subsequent event
Jun. 30, 2012
General Partnership
Jun. 30, 2012
General Partnership
Aug. 31, 2012
General Partnership
Subsequent event
Jun. 30, 2012
Minimum
Jun. 30, 2012
Minimum
Cash and cash equivalents
Jun. 30, 2012
Maximum
Jun. 30, 2012
Maximum
Cash and cash equivalents
Jun. 30, 2012
Investment Properties/Joint Venture
item
Jun. 30, 2012
Investment Properties/Joint Venture
Minimum
Jun. 30, 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                          
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   $ 6,253,000   $ 6,253,000 $ 5,051,000                                    
Advertising Expense                                              
Advertising expense   34,544 43,679                                        
Interest Capitalized                                              
Criteria of capitalization of interest on property based on specified period of construction                                 1 year            
Subsequent Events                                              
Repurchase of depository receipts (in shares)       1,197,013   251   2,053     16 1,740   1 92                
Repurchase price of depository receipts (in dollars per share)       $ 24.62   $ 26.55                                  
Repurchase of depository receipts (in shares)           $ 793.50     $ 738.60     $ 587.01 $ 1.99   $ 587.01 $ 0.11              
Repurchase of units   $ 69,379   $ 30,549,000   $ 6,995   $ 55,778     $ 12,921   $ 1,581 $ 680   $ 83