Area of a real estate property.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Including the current and noncurrent portions, aggregate carrying value as of the balance sheet date of loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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No definition available.

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The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings.

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No definition available.

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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.

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No definition available.

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The aggregate cost of investments for Federal income tax purposes.

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Debt Instrument, Extension Term

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No definition available.

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The total number of term extensions available to the borrower

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Investments in Partially Owned Entities (330 Madison Avenue, 280 Park Avenue, Toys R Us & 50 West 57th Street) (Details) ft² in Thousands	Dec. 13, 2017 USD ($) ft²	Aug. 23, 2017 USD ($) ft² myExtension	Jul. 19, 2017 USD ($) ft²	Dec. 31, 2017 USD ($)
Toys R Us
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage				32.50%
Total equity method investment				$ 0
Tax basis of investments, cost for income tax purposes				$ 420,000,000
Office \| Three Three Zero Madison Avenue
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage			25.00%
Net proceeds from debt			$ 150,000,000
Net proceeds from debt			$ 85,000,000
Office \| Two Eight Zero Park Avenue
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage		50.00%
Net proceeds from debt		$ 900,000,000
Net proceeds from debt		140,000,000
Office \| Five Zero West 57th Street
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage	50.00%
Net proceeds from debt	$ 20,000,000
Three Three Zero Madison Avenue Joint Venture \| Office \| Three Three Zero Madison Avenue
Schedule of Equity Method Investments [Line Items]
Square footage of real estate property \| ft²			845
Three Three Zero Madison Avenue Joint Venture \| Loans due August 2024 \| Office \| Three Three Zero Madison Avenue
Schedule of Equity Method Investments [Line Items]
Loans payable			$ 500,000,000
Debt term			7 years
Debt instrument, interest rate, stated percentage			3.43%
Two Eight Zero Park Avenue Joint Venture \| Loans due September 2019 \| Office \| Two Eight Zero Park Avenue
Schedule of Equity Method Investments [Line Items]
Loans payable		$ 1,200,000,000.0
Square footage of real estate property \| ft²		1,250
Debt instrument, interest rate, effective percentage				3.16%
Number of loan extensions available \| myExtension		5
Length of extension available		1 year
Five Zero West 57th Street Joint Venture \| Loans Due December 2022 \| Office \| Five Zero West 57th Street
Schedule of Equity Method Investments [Line Items]
Loans payable	$ 20,000,000
Square footage of real estate property \| ft²	81
Debt instrument, interest rate, effective percentage				3.06%
LIBOR \| Two Eight Zero Park Avenue Joint Venture \| Loans due September 2019 \| Office \| Two Eight Zero Park Avenue
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)		1.73%
LIBOR \| Five Zero West 57th Street Joint Venture \| Loans Due December 2022 \| Office \| Five Zero West 57th Street
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)	1.60%
Mortgages
Schedule of Equity Method Investments [Line Items]
Debt instrument, interest rate, effective percentage				3.54%
Mortgages \| LIBOR \| Three Three Zero Madison Avenue Joint Venture \| Loans due August 2024 \| Office \| Three Three Zero Madison Avenue
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)			1.30%
Mortgages \| LIBOR \| Two Eight Zero Park Avenue Joint Venture \| Loans due September 2019 \| Office \| Two Eight Zero Park Avenue
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)		2.00%
Mortgages \| LIBOR \| Five Zero West 57th Street Joint Venture \| Loans Due December 2022 \| Office \| Five Zero West 57th Street
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)	3.50%