REAL ESTATE AND OTHER AFFILIATES (Narrative) (Details)			1 Months Ended	3 Months Ended
	Jan. 24, 2014 USD ($) a item	Oct. 04, 2013 USD ($) a	Jan. 31, 2016 USD ($)	Mar. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($) $ / a
Real Estate and Other Affiliates
Book value of land contributed to joint venture				$ 325,412,000	$ 322,462,000
Area of land contributed to the joint venture (in acres) | a	4.5
Fair value of the land contributed to joint venture	$ 3,200,000
Percentage of ownership interest of partners in joint venture	50.00%
The Summit
Real Estate and Other Affiliates
Book value of land contributed to joint venture						$ 13,400,000
SID Bonds transferred to a joint venture						1,300,000
Transaction value of the land contributed to joint venture						$ 125,400,000
Value of land contributed to joint venture (in dollars per acre) | $ / a						226,000
Preferred return, on capital (as a percent)						5.00%
Return on capital contributions (as a percent)						5.00%
Entitlement of distribution by joint venture (in times) | item				2
The Summit | Maximum
Real Estate and Other Affiliates
Maximum capital contribution required						$ 30,000,000
33 Peck Slip
Real Estate and Other Affiliates
Investment in joint venture				$ 6,000,000
Amount of bridge loan				$ 25,000,000
33 Peck Slip | Bridge Loan [Member]
Real Estate and Other Affiliates
Interest rate margin (as a percent)				5.00%
m.flats (formerly Parcel C)
Real Estate and Other Affiliates
Transaction value of the land contributed to joint venture		$ 23,400,000
Area of land contributed to the joint venture (in acres) | a		5
Fair value of the land contributed to joint venture		$ 4,000,000
Additional capitalized development costs incurred resulting from contribution of land		3,100,000
Transaction value, per constructed unit of land contributed to joint venture		$ 53,500
Non-recourse construction loan			$ 88,000,000
Cash contributed by joint venture partner			16,100,000
Distribution of the cash contributed by joint venture partner			$ 7,300,000
Profit on partial sale of land				$ 200,000
Net investment in joint venture				100,000
m.flats (formerly Parcel C) | Construction Loan Payable
Real Estate and Other Affiliates
Option to extend, term			1 year
Constellation
Real Estate and Other Affiliates
Non-recourse construction loan	$ 15,800,000			$ 6,100,000
Number of units in Class A apartment building to be constructed | item	124
Area Of Land In Downtown Summerlin | a	400
Future contribution required					$ 1,000,000
Percentage of proceeds in excess of an amount determined by applying a specified capitalization rate to NOI	100.00%
Percent Share of Proceeds Upon Sale Of Property	50
Capitalization rate (as a percent)	7.00%
One Month LIBOR | m.flats (formerly Parcel C) | Construction Loan Payable
Real Estate and Other Affiliates
Interest rate margin (as a percent)			2.40%