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Description of Business and Organization Narrative (Details) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |
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Oct. 06, 2013 entity | Jun. 30, 2013 entity | Jun. 30, 2014 entity sqft | Jun. 30, 2014 Office Building [Member] office_and_property sqft | Jun. 30, 2014 Office Building [Member] Manhattan [Member] office_and_property sqft | Jun. 30, 2014 Office Building [Member] Fairfield County, Connecticut and Westchester County, New York [Member] sqft office_and_property | Jun. 30, 2014 Development Parcel [Member] parcel | Jun. 30, 2014 Retail Site [Member] Manhattan and Westport, Connecticut [Member] sqft | Jun. 30, 2014 Retail Site [Member] Manhattan [Member] office_and_property sqft | Jun. 30, 2014 Retail Site [Member] Westport, Connecticut [Member] office_and_property | Jun. 30, 2014 Other Property [Member] Stamford, Connecticut [Member] sqft | Jun. 30, 2014 ESRT [Member] | Jun. 30, 2014 Common Class A [Member] ESRT [Member] | Jul. 15, 2014 Subsequent Event [Member] office_and_property | Jul. 15, 2014 Subsequent Event [Member] Office Building [Member] sqft | Jul. 15, 2014 Subsequent Event [Member] Retail Site [Member] sqft
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |
OP units owned by the Company, percent |  |  | 38.90% |  |  |  |  |  |  |  |  | 38.90% |  |  |  |
Area of real estate property |  |  | 8,400,000 | 7,800,000 | 5,900,000 | 1,800,000 |  | 204,175 | 415,339 |  | 380,000 |  |  |  | 1,500,000 | 112,270
Number of properties |  |  |  | 12 | 7 | 5 | 1 |  | 4 | 2 |  |  |  | 2 |  |
Number of entities to be treated as TRS's |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of entities acquired | 4 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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