SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)		12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 31, 2018 USD ($) item		Dec. 31, 2017 USD ($) $ / shares		Dec. 31, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid expenses and other assets, net		$ 411,636,000		$ 370,027,000
Number of business segment | item		3
Adjustment to depreciation due to change in estimated useful life		$ 113,518,000		116,401,000		$ 81,878,000
Impairments		0		0		35,734,000
Tenant incentives and other receivables		8,745,000		8,482,000
Deferred leasing costs, accumulated amortization		24,800,000		18,900,000
Accumulated deficit		120,341,000		109,508,000
Deferred tax liabilities		157,188,000		160,850,000
Condominium receivables		0		158,516,000
Property, Plant and Equipment, Net		5,782,395,000		5,033,527,000
Developments		1,290,068,000		1,196,582,000
Accounts payable and accrued expenses		779,272,000		521,718,000
Reclassification out of AOCI to retained earnings	$ 1,100,000	1,148,000	[1]	0	[1]	0	[1]
Cumulative effect of adjustment	(69,732,000)
Reclassification of cash used in operating activities		(210,520,000)		(165,567,000)		(239,103,000)
Reclassification of cash used in investing activities		841,771,000		315,604,000		33,958,000
TIF receivable		2,470,000		14,444,000
Remaining performance obligation		$ 900,000,000
Service Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to depreciation due to change in estimated useful life				$ 25,500,000
Impact on diluted EPS resulting from depreciation adjustment (in dollars per share) | $ / shares				$ 0.59
Minimum | Master Planned Communities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of MPC assets		20 years
Maximum | Master Planned Communities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of MPC assets		40 years
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid expenses and other assets, net		$ (103,200,000)		$ (249,600,000)
Reclassification of cash used in operating activities				153,500,000		180,200,000
Reclassification of cash used in investing activities				7,100,000		4,600,000
Impact of Adoption of ASC Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid expenses and other assets, net	5,600,000	(75,057,000)
Accumulated deficit	69,700,000	58,851,000
Deferred tax liabilities	(19,600,000)	(16,094,000)
Condominium receivables	(154,200,000)	99,600,000
Property, Plant and Equipment, Net	3,400,000
Developments	150,800,000	153,748,000
Accounts payable and accrued expenses	$ 95,000,000	165,525,000
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standard Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of adjustment						700,000
Allowance for doubtful accounts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase from write-offs		4,714,000		$ 1,209,000		$ 2,271,000
Downtown Summerlin and Seaport District Tenants | Allowance for doubtful accounts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase from write-offs		$ 3,200,000

[1] The Company adopted Accounting Standards Update ("ASU") 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, as of January 1, 2018. See Note 1 - Summary of Significant Accounting Policies for further discussion.