REAL ESTATE AND OTHER AFFILIATES (Narrative) (Details)			1 Months Ended	3 Months Ended					12 Months Ended
	Jan. 24, 2014 USD ($) a item	Oct. 04, 2013 USD ($) a	Jan. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($) item	Dec. 31, 2016 USD ($)
Real Estate and Other Affiliates
Book value of land contributed to joint venture				$ 314,259,000					$ 320,936,000
Land sales				53,481,000		$ 41,942,000
Equity in earnings				8,520,000		1,932,000
The Summit
Real Estate and Other Affiliates
Preferred return, on capital (as a percent)								5.00%
Entitlement of distribution by joint venture (in times) | item								2
Return on capital contributions (as a percent)								100.00%
Total assets				152,200,000					151,300,000
Total liabilities				112,200,000					116,500,000
Equity				40,000,000					34,800,000
Revenues				11,500,000		0
Gross margin				6,500,000		0
Net income				5,300,000		$ (800,000)
33 Peck Slip (Grandview SHG, LLC) [Member]
Real Estate and Other Affiliates
Payments to Acquire Interest in Joint Venture					$ 2,300,000
Investment in joint venture				$ 9,000,000
33 Peck Slip (Grandview SHG, LLC) [Member] | Bridge Loan [Member]
Real Estate and Other Affiliates
Interest rate margin (as a percent)			5.00%
Amount of bridge loan			$ 25,000,000
33 Peck Slip (Grandview SHG, LLC) [Member] | Construction Loan Payable [Member]
Real Estate and Other Affiliates
Redevelopment loan					$ 36,000,000
m.flats/TEN.M
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
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									$ 6,300,000
m.flats/TEN.M | Kettler Inc
Real Estate and Other Affiliates
Payments to Acquire Interest in Joint Venture			16,100,000
m.flats/TEN.M | Construction Loan Payable [Member]
Real Estate and Other Affiliates
Non-recourse construction loan			$ 88,000,000
Option to extend, term			1 year
Constellation [Member]
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
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%
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	50.00%
Capitalization rate (as a percent)	7.00%
Percentage of project occupied				77.40%
Percentage of project leased				85.50%
Constellation [Member] | Calida Group [Member]
Real Estate and Other Affiliates
Payments to Acquire Interest in Joint Venture	$ 3,200,000
Percentage of ownership interest of partners in joint venture	50.00%
Constellation [Member] | Bridge Loan [Member]
Real Estate and Other Affiliates
Non-recourse construction loan	$ 15,800,000			$ 14,000,000
Equity Method Investments [Member] | 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, price per acre								226,000
Equity Method Investments [Member] | The Summit | Maximum [Member]
Real Estate and Other Affiliates
Maximum capital contribution required								$ 30,000,000
Equity Method Investments [Member] | Constellation [Member]
Real Estate and Other Affiliates
Future contribution required							$ 1,000,000
One Month LIBOR | m.flats/TEN.M | Construction Loan Payable [Member]
Real Estate and Other Affiliates
Interest rate margin (as a percent)			2.40%