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[Line Items] for Organization, Consolidation and Presentation of Financial Statements Disclosure [Table]

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Area of a real estate property.

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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The number of businesses acquired by the entity during the period.

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

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Description of Business and Organization - Narrative (Details)			12 Months Ended
	Oct. 07, 2013 entity	Oct. 06, 2013 entity	Dec. 31, 2015 ft² entity parcel office_and_property $ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the Company, percent			44.90%
Area of real estate property			10,100,000
Number of entities to be treated as TRS's \| entity			2
Number of entities acquired \| entity	4	4
Predecessor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			380,000
ESRT [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the Company, percent			44.90%
Common Class A [Member] \| ESRT [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Par value \| $ / shares			$ 0.01
Office Building [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			9,300,000
Number of 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			7,500,000
Number of 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			1,900,000
Number of properties \| office_and_property			5
Retail Site [Member] \| Manhattan and Westport, Connecticut [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			204,452
Retail Site [Member] \| Manhattan [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property			518,792
Number of properties \| office_and_property			4
Retail Site [Member] \| Westport, Connecticut [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of 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			380,000
Development Parcel [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties \| parcel			3
Development Parcel [Member] \| Consolidated Properties [Member] \| Predecessor [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of properties \| parcel			1