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

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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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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- Definition

Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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No definition available.

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Nominal or face amount used to calculate payments on the derivative liability.

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Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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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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This item represents the aggregate value of each identified investment accounted for under the equity method of accounting based on the quoted market price for those investments in common stock for which a quoted market price is available.

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- Definition

Balance held at close of period in number of shares.

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

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Debt Instrument, Extension Term

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Debt Instrument Maturity Date in YYYY-MM format.

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No definition available.

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Equity Method Investment Fair Value In Excess Of Carrying Amount

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This abstract relates to equity method investments and income from equity method investments

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The total number of term extensions available to the borrower

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Investments in Partially Owned Entities (Alexander's Inc.) (Details)			1 Months Ended
	Jul. 17, 2017	Jun. 02, 2017 USD ($) myExtension	May 31, 2017 USD ($)	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)
Equity Method Investments And Income From Equity Method Investments
Notes and loans payable				$ 8,131,606,000	$ 8,113,248,000
Alexanders Inc
Equity Method Investments And Income From Equity Method Investments
Ownership common shares, investee (in shares) \| shares				1,654,068
Equity method ownership percentage				32.40%
Closing share price (in dollars per share) \| $ / shares				$ 424.09
Equity method investment fair value				$ 701,474,000
Excess of investee's fair value over carrying amount				575,842,000
Excess of investee's carrying amount over equity in net assets				$ 39,418,000
Alexanders Inc \| Lexington Avenue 731 \| Office
Equity Method Investments And Income From Equity Method Investments
Notes and loans payable		$ 500,000,000
Description of variable rate basis		LIBOR	LIBOR
Interest rate, effective				2.14%
Number of loan extensions available \| myExtension		4
Length of extension available		1 year
Debt instrument maturity		2020-06	2021-03
Alexanders Inc \| Interest rate cap \| Lexington Avenue 731 \| Office
Equity Method Investments And Income From Equity Method Investments
Notional amount		$ 500,000,000
Cap interest rate		6.00%
Alexanders Inc \| Mortgage Loan Maturing in March 2021 \| Lexington Avenue 731 \| Office
Equity Method Investments And Income From Equity Method Investments
Notes and loans payable			$ 300,000,000
LIBOR
Equity Method Investments And Income From Equity Method Investments
Spread Over LIBOR (in percentage)	1.25%
LIBOR \| Alexanders Inc \| Mortgage Loan Maturing in June 2020 \| Lexington Avenue 731 \| Office
Equity Method Investments And Income From Equity Method Investments
Spread Over LIBOR (in percentage)		0.90%
LIBOR \| Alexanders Inc \| Mortgage Loan Maturing in March 2021 \| Lexington Avenue 731 \| Office
Equity Method Investments And Income From Equity Method Investments
Spread Over LIBOR (in percentage)			0.95%