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Commitments and Contingencies - Major Customers and Other Concentrations (Details) - Customer Concentration Risk [Member] - Sales Revenue, Services, Net [Member]	12 Months Ended
	Dec. 31, 2015 office_and_property tenant	Dec. 31, 2014 office_and_property tenant
Concentration Risk [Line Items]
Number of tenants | tenant	3	3
Number of properties | office_and_property	5	5
Empire State Building Co. [Member]
Concentration Risk [Line Items]
Concentration risk percentage	31.40%	33.90%
One Grand Central Place [Member]
Concentration Risk [Line Items]
Concentration risk percentage	12.20%	13.50%
111 West 33rd Street (formerly 112 West 34th Street) [Member]
Concentration Risk [Line Items]
Concentration risk percentage	8.30%	4.40%
Location 1400 Broadway [Member]
Concentration Risk [Line Items]
Concentration risk percentage	7.70%	3.90%
First Stamford Place [Member]
Concentration Risk [Line Items]
Concentration risk percentage	6.50%	7.00%
Customer 1 [Member]
Concentration Risk [Line Items]
Concentration risk percentage	6.70%	8.20%
Customer 2 [Member]
Concentration Risk [Line Items]
Concentration risk percentage	3.50%	4.20%
Customer 3 [Member]
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.30%

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- Definition

Concetration Risk, Number of Tenants

+ References

No definition available.

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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.

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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=51801978&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=49121117&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=51801978&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=49121117&loc=d3e13537-108611

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

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