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Description of Business and Organization Narrative (Details) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 06, 2013 entity | Sep. 30, 2013 entity | Sep. 30, 2014 entity sqft
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
OP units owned by the Company, percent |  |  | 36.80%
Area of real estate property |  |  | 10,000,000
Number of entities to be treated as TRS's |  |  | 2
Number of entities acquired | 4 | 4 |
Office Building [Member] |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Area of real estate property |  |  | 9,300,000
Number of properties |  |  | 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 |  |  | 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 |  |  | 1,800,000
Number of properties |  |  | 5
Development Parcel [Member] |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Number of properties |  |  | 3
Retail Site [Member] | Manhattan and Westport, Connecticut [Member] |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Area of real estate property |  |  | 204,175
Retail Site [Member] | Manhattan [Member] |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Area of real estate property |  |  | 526,539
Number of properties |  |  | 4
Retail Site [Member] | Westport, Connecticut [Member] |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Number of properties |  |  | 2
Other Property [Member] | Stamford, Connecticut [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 |  |  | 36.80%
Common Class A [Member] | ESRT [Member] |  |  |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |
Par value |  |  | $ 0.01

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References 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 + Details
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