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Description of Business and Organization - Narrative (Details) | 12 Months Ended
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Dec. 31, 2017 ft² entity parcel office_and_property $ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
OP units owned by the Company, percent | 53.80%
Area of real estate property (in sqft) | 10,100,000
Number of entities to be treated as taxable REIT subsidiary of ESRT | entity | 2
ESRT [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
OP units owned by the Company, percent | 53.80%
Common Class A [Member] | ESRT [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Par value (in dollars per share) | $ / shares | $ 0.01
Office Building [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in sqft) | 9,400,000
Number of properties (in properties) | office_and_property | 14
Office Building [Member] | Manhattan [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in sqft) | 7,600,000
Number of properties (in properties) | office_and_property | 9
Office Building [Member] | Fairfield County, Connecticut and Westchester County, New York [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in sqft) | 1,900,000
Number of properties (in properties) | office_and_property | 5
Development Parcel [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Number of properties (in properties) | parcel | 3
Retail [Member] | Manhattan and Westport, Connecticut [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in sqft) | 205,740
Retail [Member] | Manhattan [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in sqft) | 507,395
Number of properties (in properties) | office_and_property | 4
Retail [Member] | Westport, Connecticut [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Number of properties (in properties) | office_and_property | 2
Other Property [Member] | Stamford, Connecticut [Member] |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in sqft) | 380,000

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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