INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Funds (Details) $ in Thousands	1 Months Ended	6 Months Ended
	Jan. 31, 2016 USD ($)	Jun. 30, 2016 USD ($) partner	Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates		$ 284,238	$ 173,277
Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Number of unaffiliated partners | partner		2
Mervyns I and Mervyns II | Opportunity Funds | KLA/Mervyns LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment		$ 48,648
Equity method investments		26,058
Mervyns I | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment		100
Mervyns II | Opportunity Funds | KLA A Markets LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment		81,594
Equity method investments		20,717
Corporate Joint Venture | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Distributions		155,604
Investments in and advances to unconsolidated affiliates		63,216
Fund III | Cortlandt Town Center
Schedule of Equity Method Investments [Line Items]
Disposal group, percentage	65.00%
Disposal group, consideration	$ 107,300
KLA/Mervyns LLC Add-On Investments | Mervyns I and Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		7,547
Distributions		9,272
KLA A Markets LLC Add-On Investments | Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		2,416
Distributions		4,864
KA-Shopko LLC | Fund II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		1,110
Distributions		3,358
Marsh and Add-On Investments | Fund II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		2,667
Distributions		2,941
KLAC Rex Venture LLC | Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		2,701
Distributions		4,927
Operating Partnership, as General Partner or Managing Member | Mervyns I and Mervyns II | Opportunity Funds | KLA/Mervyns LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment		11,821
Equity method investments		4,901
Operating Partnership, as General Partner or Managing Member | Mervyns II | Opportunity Funds | KLA A Markets LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment		16,318
Equity method investments		4,239
Operating Partnership, as General Partner or Managing Member | Corporate Joint Venture | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Distributions		33,374
Investments in and advances to unconsolidated affiliates		12,070
Operating Partnership, as General Partner or Managing Member | KLA/Mervyns LLC Add-On Investments | Mervyns I and Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		1,252
Distributions		2,017
Operating Partnership, as General Partner or Managing Member | KLA A Markets LLC Add-On Investments | Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		388
Distributions		972
Operating Partnership, as General Partner or Managing Member | KA-Shopko LLC | Fund II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		222
Distributions		672
Operating Partnership, as General Partner or Managing Member | Marsh and Add-On Investments | Fund II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		533
Distributions		588
Operating Partnership, as General Partner or Managing Member | KLAC Rex Venture LLC | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment		20
Operating Partnership, as General Partner or Managing Member | KLAC Rex Venture LLC | Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		535
Distributions		$ 986