SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-Based Compensation, Income Taxes, and Concentration of Credit Risk (Details) $ in Thousands, ft² in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016 USD ($) ft² mall	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) ft² mall	Sep. 30, 2015 USD ($)
Concentration Risk [Line Items]
Area of real estate property (in sq ft) \| ft²	14.8		14.8
Total revenue \| $	$ 79,973	$ 79,825	$ 242,498	$ 242,323
Puerto Rico
Concentration Risk [Line Items]
Number of real estate properties \| mall	2		2

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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