STOCK BASED PLANS (Details) (USD $)	12 Months Ended			12 Months Ended										12 Months Ended			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Nov. 09, 2010	Dec. 31, 2012 Minimum	Dec. 31, 2010 GGP	Dec. 31, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 31, 2012 Stock options Minimum	Dec. 31, 2012 Stock options Maximum	Dec. 31, 2012 Stock options General and administrative expenses	Dec. 31, 2012 Stock options $46.49 - 55.82	Dec. 31, 2012 Stock options $46.49 - 55.82 Minimum	Dec. 31, 2012 Stock options $46.49 - 55.82 Maximum	Dec. 31, 2012 Stock options $57.77 - 60.33	Dec. 31, 2012 Stock options $57.77 - 60.33 Minimum	Dec. 31, 2012 Stock options $57.77 - 60.33 Maximum	Dec. 31, 2012 Stock options $61.64 - 69.75	Dec. 31, 2012 Stock options $61.64 - 69.75 Minimum	Dec. 31, 2012 Stock options $61.64 - 69.75 Maximum
Stock-based plans
Shares of common stock reserved for issuance			3,698,050
Vesting period of options granted	5 years
Expiration period	10 years
Excercisable period				5 years
Recognized compensation expense	$ 4,300,000	$ 3,000,000			$ 600,000					$ 3,000,000
Maximum number of shares available for future grant	2,758,729
Number of shares of entity common stock issued for each existing GGP option						0.0983
Number of shares of GGP used as a basis for replacement options						1
Stock option activity
Stock Options Outstanding at the beginning of the period (in shares)						712,640
Granted (in shares)						200,000	751,840
Forfeited (in shares)						(50,700)	(39,200)
Stock Options Outstanding at the end of the period (in shares)						861,940	712,640
Remaining unvested options outstanding and expected to vest (in shares)						828,536
Weighted Average Exercise Price
Stock Options Outstanding at the beginning of the period (in dollars per share)						$ 57.72
Granted (in dollars per share)						$ 64.19	$ 57.81
Forfeited (in dollars per share)						$ 58.62	$ 59.44
Stock Options Outstanding at the end of the period (in dollars per share)						$ 59.17	$ 57.72
Stock options expected to vest at the end of the period (in dollars per share)						$ 59.16
Weighted average remaining contractual term of stock options expected to vest						8 years 6 months
Aggregate intrinsic value						11,941,409
Aggregate intrinsic value of stock options expected to vest						11,481,453
Exercise price range of stock options
Exercise Price (in dollars per share)						$ 59.17					$ 51.19	$ 46.49	$ 55.82	$ 58.00	$ 57.77	$ 60.33	$ 66.26	$ 61.64	$ 69.75
Number Outstanding (in shares)						861,940					66,500			619,000			176,440
Weighted Average Remaining Contractual Term						8 years 6 months					8 years 8 months 12 days			8 years 3 months 18 days			9 years 2 months 12 days
Significant assumptions used in Black-Scholes option-pricing model
Weighted average grant date fair value (in dollars per share)						$ 19.33		$ 18.77	$ 20.51
Weighted-average expected life of options						7 years 3 months 18 days		7 years 2 months 12 days	7 years 4 months 24 days
Weighted-average risk-free interest rate (as a percent)						1.40%		1.10%	1.90%
Weighted-average expected volatility (as a percent)						25.00%		23.00%	27.00%
Unamortized stock option expense						$ 12,800,000
Weighted-average period for recognition of unamortized stock option expense						3 years 7 months 6 days