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Acquisitions - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Jul. 15, 2014	Jul. 15, 2014
112 West 34th Street [Member]
Business Acquisition [Line Items]
Total consideration paid	$ 423.6us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Debt assumed	87.7us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Payments to Acquire Businesses, Gross	106.9us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	229.0us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	13,753,009us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Business Acquisition, Share Price	$ 16.65us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember	$ 16.65us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = esrt_A112West34thStreetMember
Location 1400 Broadway [Member]
Business Acquisition [Line Items]
Total consideration paid	310.0us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Debt assumed	80.0us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Payments to Acquire Businesses, Gross	79.7us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 150.3us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	9,029,456us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember
Business Acquisition, Share Price	$ 16.65us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember	$ 16.65us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = esrt_Location1400BroadwayMember

X

- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)(4)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

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- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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-Name Accounting Standards Codification

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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-Paragraph 8

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- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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-Paragraph 8

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-Name Accounting Standards Codification

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-SubTopic 30

-Section 25

-Paragraph 5

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

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-Paragraph 13

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