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Description of Business and Organization - Narrative (Details) | 6 Months Ended
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Jun. 30, 2017 ft² parcel office_and_property
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in square feet) | 10,100,000
OP units owned by the Company (as a percent) | 52.80%
Office Building |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in square feet) | 9,400,000
Number of properties | office_and_property | 14
Office Building | Manhattan |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in square feet) | 7,600,000
Number of properties | office_and_property | 9
Office Building | Fairfield County, Connecticut and Westchester County, New York |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in square feet) | 1,900,000
Number of properties | office_and_property | 5
Development Parcel |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Number of properties | parcel | 3
Retail Site | Manhattan and Westport, Connecticut |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in square feet) | 204,452
Retail Site | Manhattan |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in square feet) | 495,310
Number of properties | office_and_property | 4
Retail Site | Westport, Connecticut |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Number of properties | office_and_property | 2
Other Property | Stamford, Connecticut |
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items] |
Area of real estate property (in square feet) | 380,000

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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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