REAL ESTATE AND OTHER AFFILIATES (Narrative) (Details)					1 Months Ended		3 Months Ended				9 Months Ended
	Jun. 01, 2016 a	Mar. 16, 2016 ft²	Jan. 24, 2014 USD ($) a item	Oct. 04, 2013 USD ($) a	Jun. 30, 2016 a	Jan. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2015 USD ($) item $ / a	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Real Estate and Other Affiliates
Book value of land contributed to joint venture							$ 314,400,000	$ 322,462,000			$ 314,400,000
Area of land sold | ft²		42,694
Land sales							44,128,000		$ 45,423,000		147,168,000	$ 138,937,000
Equity in earnings							13,493,000		$ 295,000		35,700,000	$ 3,164,000
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%
Entitlement of distribution by joint venture (in times) | item										2
Land sales											216,600,000
Amount of lot closing completed							119,800,000
Equity in earnings											22,600,000
The Summit | Maximum
Real Estate and Other Affiliates
Maximum capital contribution required										$ 30,000,000
Grandview SHG, LLC
Real Estate and Other Affiliates
Investment in joint venture							8,100,000				8,100,000
Amount of bridge loan							25,000,000				25,000,000
Redevelopment loan							36,000,000				36,000,000
Additional capital contribution							2,300,000				$ 2,300,000
Grandview SHG, LLC | Bridge Loan [Member]
Real Estate and Other Affiliates
Interest rate margin (as a percent)											5.00%
Circle T Ranch
Real Estate and Other Affiliates
Area of land sold | a	74				74
Equity in earnings											$ 10,500,000
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
Total book value contribution				$ 7,100,000
Contribution made till date							3,900,000				6,300,000
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
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
Non-recourse construction loan			$ 15,800,000				$ 11,900,000				$ 11,900,000
Number of units in Class A apartment building to be constructed | item			124
Area Of Land In Downtown Summerlin | a			400
Percentage of ownership interest of partners in joint venture			50.00%
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%
Percentage of project occupied							14.50%				14.50%
Percentage of project leased							42.70%				42.70%
One Month LIBOR | m.flats (formerly Parcel C) | Construction Loan Payable
Real Estate and Other Affiliates
Interest rate margin (as a percent)						2.40%