Long-Term Debt (Borgata Senior Secured Notes Narrative) (Details) (USD $)					6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Borgata	Dec. 31, 2011 Borgata	Jun. 30, 2012 Borgata Senior Secured Notes	Aug. 06, 2010 Borgata Senior Secured Notes	Jun. 30, 2012 Borgata Senior Secured Notes 9.50% Senior Secured Notes Due 2015	Dec. 31, 2011 Borgata Senior Secured Notes 9.50% Senior Secured Notes Due 2015	Aug. 31, 2010 Borgata Senior Secured Notes 9.50% Senior Secured Notes Due 2015	Jun. 30, 2012 Borgata Senior Secured Notes 9.50% Senior Secured Notes Due 2015 Prior to October 15, 2013	Jun. 30, 2012 Borgata Senior Secured Notes 9.50% Senior Secured Notes Due 2015 On or After October 15, 2013 and Prior to October 15, 2014	Jun. 30, 2012 Borgata Senior Secured Notes 9.50% Senior Secured Notes Due 2015 On or After October 15, 2014	Jun. 30, 2012 Borgata Senior Secured Notes 9.875% Senior Secured Notes Due 2018	Dec. 31, 2011 Borgata Senior Secured Notes 9.875% Senior Secured Notes Due 2018	Aug. 31, 2010 Borgata Senior Secured Notes 9.875% Senior Secured Notes Due 2018	Jun. 30, 2012 Borgata Senior Secured Notes 9.875% Senior Secured Notes Due 2018 Prior to August 15, 2014	Jun. 30, 2012 Borgata Senior Secured Notes 9.875% Senior Secured Notes Due 2018 Prior to August 15, 2013	Jun. 30, 2012 Borgata Senior Secured Notes 9.875% Senior Secured Notes Due 2018 On or After August 15, 2014 and Prior to August 15, 2015	Jun. 30, 2012 Borgata Senior Secured Notes 9.875% Senior Secured Notes Due 2018 On or After August 15, 2015 and Prior to August 15, 2016	Jun. 30, 2012 Borgata Senior Secured Notes 9.875% Senior Secured Notes Due 2018 On or After August 15, 2016	Jun. 30, 2012 Borgata Bank Credit Facility	Dec. 31, 2011 Borgata Bank Credit Facility	Aug. 06, 2010 Borgata Bank Credit Facility	Aug. 31, 2010 Minimum Borgata Senior Secured Notes	Jun. 30, 2012 Maximum 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
Debt Instrument [Line Items]
Face amount						$ 800,000,000			$ 400,000,000						$ 400,000,000
Debt instrument, stated interest rate									9.50%						9.875%
Effective interest rate at period end							10.20%						10.30%
Issue price, net of discount, % of principal									98.943%						99.315%
Unamortized discount	10,950,000	9,955,000	5,145,000	5,637,000			2,907,000	3,271,000	4,200,000				2,238,000	2,366,000	2,700,000						0	0
Redemption price, % of principal, subject to make-whole premium										100.00%						100.00%
Redemption price, % of principal										103.00%	104.75%	102.375%					103.00%	104.938%	102.469%	100.00%
Annual redeemable portion of principal amount, %										10.00%							10.00%
Redeemable portion of principal amount, %										35.00%							35.00%
Redemption price, % of principal, redeemable with proceeds from certain equity offerings										109.50%							109.875%
Minimum required coverage ratio					2
Actual coverage ratio																								2	2
Line of credit, maximum borrowing capacity																							150,000,000				75,000,000
Amount outstanding																										24,200,000
Remaining borrowing capacity																										$ 50,800,000