Long-Term Debt (Borgata Bank Credit Facility Narrative) (Details) (USD $)	6 Months Ended			3 Months Ended		6 Months Ended				6 Months Ended		0 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Aug. 06, 2010 Borgata	Jun. 30, 2012 Borgata Bank Credit Facility	Jun. 30, 2011 Borgata Bank Credit Facility	Jun. 30, 2012 Borgata Bank Credit Facility	Mar. 31, 2011 Borgata Bank Credit Facility	Aug. 06, 2010 Borgata Bank Credit Facility	Aug. 06, 2010 Borgata Senior Secured Notes	Jun. 30, 2012 Borgata Bank Credit Facility Amendment Borgata Bank Credit Facility	Nov. 11, 2011 Borgata Bank Credit Facility Amendment Borgata Bank Credit Facility	Nov. 11, 2011 Borgata Bank Credit Facility Amendment Borgata Bank Credit Facility Minimum	Jun. 30, 2012 Borgata Bank Credit Facility Amendment Borgata Bank Credit Facility Minimum	Jun. 30, 2012 Borgata Bank Credit Facility Amendment Borgata Bank Credit Facility Maximum	Jun. 30, 2012 Borgata Bank Credit Facility Amendment Borgata Bank Credit Facility One-month Eurodollar
Debt Instrument [Line Items]
Payments of Debt Issuance Costs	$ 10,246,000	$ 828,000		$ 0	$ 400,000	$ 0
Debt financing, maximum borrowing capacity			950,000,000
Line of credit, maximum borrowing capacity								150,000,000			75,000,000
Face amount									800,000,000
Consolidated EBITDA required												125,000,000
Amount outstanding threshold over which borrowing to fund repurchase of senior notes is prohibited												65,000,000
Interest rate spread, alternative															1.00%
Percentage bearing variable interest, percentage rate													1.50%
Commitment fee percentage on unused portion of credit facility													0.50%	1.00%
Amount outstanding										24,200,000
Interest rate at period end										4.40%
Remaining borrowing capacity										50,800,000
Consolidated EBITDA, actual										162,200,000
Deferred finance costs							$ 400,000