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Related Party Transactions - Excluded Properties and Businesses (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) office_and_property property interest | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Retail [Member] | Manhattan [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | office_and_property | 4 |  |
Office Building [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | office_and_property | 14 |  |
Office Building [Member] | Manhattan [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | office_and_property | 9 |  |
Malkin Group [Member] | Mezzanine and Senior Equity Funds [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of interests owned (interest) | interest | 2 |  |
Malkin Group [Member] | Residential Property Manager [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | interest | 5 |  |
Number of interests owned (interest) | interest | 5 |  |
Malkin Group [Member] | Multi-family Property [Member] | Greenwich, Connecticut [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | 7 |  |
Malkin Group [Member] | Retail [Member] | Greenwich, Connecticut [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | 5 |  |
Malkin Group [Member] | Retail [Member] | Manhattan [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | 2 |  |
Malkin Group [Member] | Former Post Office [Member] | Greenwich, Connecticut [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | 1 |  |
Malkin Group [Member] | Office Building [Member] | Manhattan [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Number of properties (in properties) | 1 |  |
Supervisory fee revenue [Member] | Third party management and other fees [Member] | Affiliated Entity [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | $ | $ 1.1 | $ 1.4 | $ 1.8
Property management fee revenue [Member] | Third party management and other fees [Member] | Affiliated Entity [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | $ | $ 0.3 | $ 0.4 | $ 0.3

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-07.1(c)) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999 + Details
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