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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 |
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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 |  |  |  |  |  |  |

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- Definition The number of underlying shares represented by one American Depository Receipt (ADR) or Global Depository Receipt (GDR). A value of "3" means that one ADR represents 3 underlying shares. If one underlying share represents 2 ADR's then the value would be represented as "0.5". + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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