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Commitments and Contingencies - Major Customers and Other Concentrations (Details) - Customer concentration risk - Rental revenue | 12 Months Ended
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Dec. 31, 2018 office_and_property tenant | Dec. 31, 2017 office_and_property tenant | Dec. 31, 2016 office_and_property tenant
Concentration Risk [Line Items] |  |  |
Number of tenants | tenant | 5 | 5 | 5
Number of properties (in properties) | office_and_property | 6 | 6 | 6
Empire State Building |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 31.90% | 32.00% | 32.60%
One Grand Central Place |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 12.80% | 13.10% | 12.50%
111 West 33rd Street |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 9.30% | 8.60% | 6.80%
1400 Broadway |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 7.10% | 7.40% | 7.80%
First Stamford Place |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 5.90% | 5.40% | 6.40%
250 West 57th Street |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 5.20% | 5.20% | 5.30%
Customer 1 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 6.00% | 6.30% | 6.40%
Customer 2 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 3.10% | 3.20% | 3.30%
Customer 3 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 2.90% | 2.90% | 2.90%
Customer 4 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 2.00% | 2.10% | 2.30%
Customer 5 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 2.00% | 2.00% | 2.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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