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Commitments and Contingencies Unfunded Capital Expenditures (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Unfunded capital expenditures	$ 72.4esrt_UnfundedCapitalExpenditures

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- Definition

Unfunded Capital Expenditures

+ References

No definition available.

+ Details

Name:	esrt_UnfundedCapitalExpenditures
Namespace Prefix:	esrt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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