Description of Business and Organization (Details) ft² in Millions	9 Months Ended
	Sep. 30, 2023 ft² office_property property_unit parcel
Empire state realty trust | Empire state realty OP
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the Company (as a percent)	59.90%
Office Building
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	8.6
Number of offices and properties | office_property	11
Office Building | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	7.6
Number of offices and properties | office_property	9
Office Building | Stamford, Connecticut
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	1.1
Number of offices and properties | office_property	2
Retail Site
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	0.7
Retail Site | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	0.7
Multifamily
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of property units | property_unit	727
Multifamily | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of property units | property_unit	721
Multifamily | New York City
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of property units | property_unit	727
Long-term ground leasehold interests
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of offices and properties | parcel	3
Other Property | Stamford, Connecticut
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	0.4