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Investments in Non-controlled Entities - Schedule of Equity Method Investments (Details) - entity	Oct. 07, 2013	Oct. 06, 2013
Schedule of Equity Method Investments [Line Items]
Number of entities acquired	4	4
Empire State Building [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 [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage		20.469%

X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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- Definition

The number of businesses acquired by the entity during the period.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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