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Capital - Distributions (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract]
Distributions paid to OP unitholders	$ 22,700,000us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	$ 20,900,000us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Distributions paid to preferred unitholders	$ 234,000esrt_PaymentsofPrivatePerpetualPreferredUnitsDistributions

X

- Definition

Payments of Private Perpetual Preferred Units Distributions

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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