Long-Term Debt (Schedule of Long-term Debt) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013 Senior Notes 9.125% Senior Notes Due 2018	Sep. 30, 2013 Senior Notes 9.00% Senior Notes Due 2020	Sep. 30, 2014 Parent	Dec. 31, 2013 Parent	Sep. 30, 2014 Parent Bank Credit Facility	Dec. 31, 2013 Parent Bank Credit Facility	Sep. 30, 2014 Parent Bank Credit Facility Bank Credit Facility [Member]	Dec. 31, 2013 Parent Bank Credit Facility Bank Credit Facility [Member]	Sep. 30, 2014 Parent Senior Notes 9.125% Senior Notes Due 2018	Dec. 31, 2013 Parent Senior Notes 9.125% Senior Notes Due 2018	Sep. 30, 2014 Parent Senior Notes 9.00% Senior Notes Due 2020	Dec. 31, 2013 Parent Senior Notes 9.00% Senior Notes Due 2020	Sep. 30, 2014 Parent Other Holdco Note [Member]	Dec. 31, 2013 Parent Other Holdco Note [Member]	Sep. 30, 2014 Subsidiary, Peninsula Gaming [Member]	Dec. 31, 2013 Subsidiary, Peninsula Gaming [Member]	Sep. 30, 2014 Subsidiary, Peninsula Gaming [Member] Bank Credit Facility	Sep. 30, 2014 Subsidiary, Peninsula Gaming [Member] Bank Credit Facility Bank Credit Facility [Member]	Dec. 31, 2013 Subsidiary, Peninsula Gaming [Member] Bank Credit Facility Bank Credit Facility [Member]	Sep. 30, 2014 Subsidiary, Peninsula Gaming [Member] Senior Notes Peninsula Senior Notes due 2018 [Member]	Dec. 31, 2013 Subsidiary, Peninsula Gaming [Member] Senior Notes Peninsula Senior Notes due 2018 [Member]	Sep. 30, 2014 Subsidiary, Peninsula Gaming [Member] Other	Dec. 31, 2013 Subsidiary, Peninsula Gaming [Member] Other	Sep. 30, 2014 Consolidated, Excluding Borgata [Member]	Dec. 31, 2013 Consolidated, Excluding Borgata [Member]	Dec. 31, 2013 Subsidiary, Borgata	Dec. 31, 2013 Subsidiary, Borgata Bank Credit Facility Bank Credit Facility [Member]	Dec. 31, 2013 Subsidiary, Borgata Secured Debt [Member] Term Loan [Member]	Dec. 31, 2013 Subsidiary, Borgata Term Loan [Member]	Dec. 31, 2013 Subsidiary, Borgata Senior Secured Notes Senior Secured Notes Due 2018 [Member]
Debt Instrument [Line Items]
Interest rate at period end									3.67%	3.66%					6.00%	6.00%				4.25%	4.20%								3.86%
Amount outstanding							$ 1,370,575,000	$ 1,463,492,000											$ 760,900,000
Remaining borrowing capacity							311,100,000												30,000,000
Interest added to principal	4,300,000
Long-term Debt, Gross					2,371,645,000	2,460,755,000				1,467,725,000		500,000,000		350,000,000		143,030,000	1,110,906,000	1,152,162,000			802,150,000		350,000,000		12,000	3,482,551,000	3,612,917,000	813,400,000	39,900,000	380,000,000		393,500,000
Unamortized discount	(16,978,000)	(27,181,000)			(16,978,000)	(21,604,000)			(3,750,000)	(4,233,000)	0	0	0	0	(13,228,000)	(17,371,000)	0	0		0	0	0	0	0	0	(16,978,000)	(21,604,000)	(5,577,000)	0		(3,766,000)	(1,811,000)
Unamortized origination fees	(5,155,000)	(12,645,000)			(5,155,000)	(6,082,000)			0	0	(5,155,000)	(6,082,000)	0	0	0	0	0	0		0	0	0	0	0	0	(5,155,000)	(6,082,000)	(6,563,000)	0		0	(6,563,000)
Long-term debt, net					2,349,512,000	2,433,069,000				1,463,492,000		493,918,000		350,000,000		125,659,000	1,110,906,000	1,152,162,000			802,150,000		350,000,000		12,000	3,460,418,000	3,585,231,000	801,260,000	39,900,000	376,234,000		385,126,000
Debt Instrument, Interest Rate, Effective Percentage																														6.75%
Debt Instrument, Interest Rate, Stated Percentage			9.125%	9.00%							9.13%	9.13%	9.00%	9.00%								8.38%	8.38%									9.88%
Current maturities of long-term debt	27,693,000	33,559,000			21,500,000	21,500,000
Long-term debt, gross, excluding current maturities	3,454,858,000	4,392,758,000
Long-term debt, net of current maturities	$ 3,432,725,000	$ 4,352,932,000			$ 2,193,920,000	$ 2,285,910,000