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Investments in Non-controlled Entities Schedule of Equity Method Investments (Details) | 0 Months Ended | 3 Months Ended
--- | --- | ---
Oct. 06, 2013 entity | Sep. 30, 2013 entity
Schedule of Equity Method Investments [Line Items] |  |
Number of entities acquired | 4 | 4
Empire State Building, L.L.C. [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage |  | 23.75%
1333 Broadway Associates [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage |  | 50.00%
1350 Broadway Associates [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage |  | 50.00%
501 Seventh Avenue Associates [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership percentage |  | 20.469%

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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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- Details
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Namespace Prefix: | us-gaap_
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