LITIGATION (Details) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Oct. 31, 2004 Urban Litigation item	Mar. 31, 2013 HHC	Dec. 31, 2011 Homart Note	Jun. 22, 2011 Homart Note	Mar. 31, 2013 2006 Credit Facility	Dec. 31, 2012 2006 Credit Facility
Litigation
Number of directors of the reporting entity, serving on the board of directors of, and is an investor in, an entity that is a principal investor in Urban Plaintiffs			1
Default Interest
Principal amount outstanding					$ 254,000,000		$ 2,600,000,000
Outstanding default interest and principal amount						246,000,000
Default interest expense					11,700,000
Default interest accrued								96,100,000
Tax Indemnification Liability
Successor indemnified percentage of losses of HHC and its subsidiaries				93.75%
Maximum amount indemnified, solely to the extent directly attributable to MPC Taxes				303,800,000
Tax indemnification liability	303,586,000	303,750,000
Accrued interest related to tax indemnification liability	21,600,000	21,600,000
Management's best estimate of aggregate liability	325,200,000
Period during which the entity does not expect to make any payments on tax indemnification liability	12 months
Repayment amount							$ 97,400,000