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Organization and Basis of Presentation (Details) - property | 3 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Jan. 31, 2010
Consolidated Entities [Line Items] |  |
Number of gaming entertainment properties | 24 |
Subsidiary, Borgata |  |
Consolidated Entities [Line Items] |  |
Equity Method Investment, Ownership Percentage |  | 50.00%

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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