Description of Business and Organization (Details) ft² in Millions	6 Months Ended
Jun. 30, 2026 ft² office_property parcel property_unit $ / shares
Empire State Realty OP \| Empire State Realty Trust
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the company (as percent)	61.00%
ESRT \| Common Class A
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Par value (in dollars per share) \| $ / shares	$ 0.01
Office Building
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of offices and properties \| office_property	9
Office Building \| New York City
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	7.5
Retail Site \| New York City
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	0.8
Multifamily \| New York City
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of property units \| property_unit	743
Development Parcel
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of offices and properties \| parcel	1

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Area of a real estate property.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Face amount or stated value per share of common stock.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
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-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

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The number of real estate properties owned as of the balance sheet date.

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