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Commitments and Contingencies - Major Customers and Other Concentrations (Details) - Customer concentration risk [Member] - Rental revenue [Member] | 12 Months Ended
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Dec. 31, 2017 office_and_property tenant | Dec. 31, 2016 office_and_property tenant | Dec. 31, 2015 office_and_property tenant
Concentration Risk [Line Items] |  |  |
Number of tenants | tenant | 5 | 5 | 3
Number of properties (in properties) | office_and_property | 6 | 6 | 6
Empire State Building Co. [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 32.00% | 32.60% | 31.40%
One Grand Central Place [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 13.10% | 12.50% | 12.20%
111 West 33rd Street [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 8.60% | 6.80% | 8.30%
1400 Broadway [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 7.40% | 7.80% | 7.70%
First Stamford Place [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 5.40% | 6.40% | 6.50%
250 West 57th Street [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 5.20% | 5.30% | 4.80%
Customer 1 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 6.30% | 6.40% | 6.70%
Customer 2 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 3.20% | 3.30% | 3.50%
Customer 3 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 2.90% | 2.90% | 2.00%
Customer 4 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 2.10% | 2.30% |
Customer 5 [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk percentage | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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