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Investments in Non-controlled Entities Schedule of Equity Method Investments (Details)	0 Months Ended
	Oct. 06, 2013 entity	Dec. 31, 2012 Empire State Building, L.L.C. [Member]	Dec. 31, 2012 1333 Broadway Associates [Member]	Dec. 31, 2012 1350 Broadway Associates [Member]	Dec. 31, 2012 501 Seventh Avenue Associates [Member]
Schedule of Equity Method Investments [Line Items]
Number of entities acquired	4
Ownership percentage		23.75%	50.00%	50.00%	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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