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Commitments and Contingencies (Loss Contingency) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |||||
|---|---|---|---|---|---|---|
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Sep. 30, 2013
action
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Sep. 30, 2013
Property Tax Assessment
|
Dec. 31, 2009
State of Nevada Department of Taxation
Sales and Use Tax Deficiency
|
Dec. 31, 2009
State of New Jersey
Real Estate Taxes [Member]
|
Dec. 31, 2010
Subsidiary, Borgata
Property Tax Assessment
|
Dec. 31, 2009
Subsidiary, Borgata
Property Tax Assessment
|
|
| Loss Contingencies [Line Items] | ||||||
| Number of legal actions brought against company to date | 2 | |||||
| Amount of assessment by taxing authority | $ 12.3 | $ 2,300.0 | ||||
| Amount of interest assessed by taxing authority | 7.5 | |||||
| Increase in assessed property value, percentage | 46.00% | |||||
| Range of possible additional property tax obligation, minimum | 5.4 | |||||
| Range of possible additional tax obligation, maximum | 14.7 | 870.0 | 880.0 | |||
| Accrual for potential property tax obligation | $ 14.7 | |||||