Native American Development - Gun Lake (Details) (USD $) In Millions, unless otherwise specified			6 Months Ended				6 Months Ended
	Jun. 30, 2012 MPM Enterprises, LLC [Member]	Jun. 30, 2012 MPM Enterprises, LLC [Member] 50% Ownership Interest [Member]	Jun. 30, 2012 Gun Lake Tribe [Member] Table_Games	Jun. 30, 2012 Gun Lake Tribe [Member] Grand Rapids, MI [Member] mi	Jun. 30, 2012 Gun Lake Tribe [Member] Kalamazoo, MI [Member] mi	Mar. 27, 2012 Gun Lake Tribe [Member] Maximum [Member] Slot_Machines	Jun. 30, 2012 Gun Lake Tribe [Member] 1st Tier [Member]	Jun. 30, 2012 Gun Lake Tribe [Member] 2nd Tier [Member]	Jun. 30, 2012 Gun Lake Tribe [Member] 3rd Tier [Member]	Jun. 30, 2012 Gun Lake Tribe [Member] Net Income [Member]	Jun. 30, 2012 Gun Lake Tribe [Member] Land Held for Development [Member] acre
Development and Management Agreements, Native American [Line Items]
Ownership percentage, parent	50.00%	50.00%
Area of land for project											147
Distance from major city				25	27
Number of slot machines						1,500
Number of table games			28
Management agreement, term			7 years
Project management fee (percentage)										30.00%
Project management fee shared with parent (percentage)							50.00%	83.00%	93.00%
Management fees, value range							$ 24	$ 24	$ 48