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Related Party Transactions - Excluded Properties and Businesses (Details)	Dec. 31, 2015 office_and_property property interest
Retail Site [Member] | Manhattan [Member]
Related Party Transaction [Line Items]
Number of properties | office_and_property	4
Office Building [Member]
Related Party Transaction [Line Items]
Number of properties | office_and_property	14
Office Building [Member] | Manhattan [Member]
Related Party Transaction [Line Items]
Number of 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] | Industrial Funds [Member]
Related Party Transaction [Line Items]
Number of interests owned (interest) | interest	3
Malkin Group [Member] | Residential Property Manager [Member]
Related Party Transaction [Line Items]
Number of 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	7
Malkin Group [Member] | Retail Site [Member] | Greenwich, Connecticut [Member]
Related Party Transaction [Line Items]
Number of properties	6
Malkin Group [Member] | Retail Site [Member] | Manhattan [Member]
Related Party Transaction [Line Items]
Number of properties	2
Malkin Group [Member] | Former Post Office [Member] | Greenwich, Connecticut [Member]
Related Party Transaction [Line Items]
Number of properties	1
Malkin Group [Member] | Office Building [Member] | Manhattan [Member]
Related Party Transaction [Line Items]
Number of properties	1

X

- Definition

Number of Interests Owned

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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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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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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