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Summary of Significant Accounting Policies (CRDA) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
New Jersey Casino Reinvestment Development Authority (CRDA)
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Jun. 30, 2013
New Jersey Casino Reinvestment Development Authority (CRDA)
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Sep. 30, 2013
Other Assets
New Jersey Casino Reinvestment Development Authority (CRDA)
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Dec. 31, 2012
Other Assets
New Jersey Casino Reinvestment Development Authority (CRDA)
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Sep. 30, 2013
State of New Jersey
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Jun. 30, 2013
Subsidiary, Borgata
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| Schedule of CRDA Deposits [Line Items] | ||||||||||
| State Gaming Licenses, Annual Fee, Percentage of Licensee Gross Gaming Revenues | 1.25% | |||||||||
| State Alternative Investment Tax, Percentage of Gross Gaming Revenues | 2.50% | |||||||||
| Deposits with CRDA | $ 3,700,000 | $ 28,500,000 | ||||||||
| Deposit assets included in CRDA settlement agreement to be donated, percentage | 50.00% | |||||||||
| Deposit assets included in settlement agreement to be refunded, percentage | 50.00% | |||||||||
| Deposit assets included in CRDA settlement agreement | 45,100,000 | |||||||||
| Impairments of assets | $ 1,250,000 | $ 0 | $ 6,282,000 | $ 0 | $ 5,000,000 | |||||