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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%

X

- 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_
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Balance Type:	na
Period Type:	instant

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration