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

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Real Estate Fund Investments (Narrative) (Details)					12 Months Ended
Real Estate Fund Investments (Narrative) (Details)	Apr. 19, 2018 USD ($) extension	Feb. 16, 2018 USD ($)	Jan. 17, 2018 USD ($)	Mar. 01, 2011 USD ($)	Dec. 31, 2018 USD ($) investment	Dec. 31, 2017 USD ($) investment	Dec. 31, 2016 USD ($)
Investment Holdings
Net gains on sale of real estate and other					$ 0	$ 3,489,000	$ 5,074,000
(Loss) income from real estate fund investments					(89,231,000)	3,240,000	(23,602,000)
Our share of net income (loss)					9,149,000	15,200,000	168,948,000
Real estate fund investments					$ 318,758,000	354,804,000
Real estate fund investments
Investment Holdings
Equity method ownership percentage					25.00%
(Loss) income from real estate fund investments					$ (89,231,000)	$ 3,240,000	$ (23,602,000)
Number of investments held by fund \| investment					4	5
Real estate fund investments					$ 318,758,000	$ 354,804,000
Excess of fair value below cost					6,806,000
Unfunded commitments of Fund					$ 50,494,000
Vornado Capital Partners Real Estate Fund
Investment Holdings
Term of the Fund, years					8 years
Investment period for commitments of the Fund, years					3 years
Vornado Realty Trust Excluding Real Estate Fund \| Crowne Plaza Time Square Hotel
Investment Holdings
Equity method ownership percentage					24.70%
Vornado Realty Trust
Investment Holdings
Unfunded commitments of Fund					$ 16,119,000
Crowne Plaza Times Square Hotel Joint Venture
Investment Holdings
Loans payable	$ 255,000,000
Loans Due May 2020 \| Crowne Plaza Times Square Hotel Joint Venture
Investment Holdings
Debt instrument, interest rate, stated percentage					6.00%
Loans Due May 2020 \| Crowne Plaza Times Square Hotel Joint Venture \| LIBOR
Investment Holdings
Spread Over LIBOR (in percentage)	3.53%
Number of extensions \| extension	3
Length of extension available	1 year
Loans Due December 2018 \| Crowne Plaza Times Square Hotel Joint Venture
Investment Holdings
Loans payable	$ 310,000,000
Loans Due December 2018 \| Crowne Plaza Times Square Hotel Joint Venture \| LIBOR
Investment Holdings
Spread Over LIBOR (in percentage)	2.80%
11 East 68th Street
Investment Holdings
Cash proceeds from sale of real estate			$ 82,000,000
Net gains on sale of real estate and other			$ 46,259,000
One Park Avenue
Investment Holdings
Payments to acquire real estate				$ 394,000,000
Real estate tax expense				$ 3,000,000	$ 4,978,000
Joint Venture \| Crowne Plaza Time Square Hotel
Investment Holdings
Equity method ownership percentage					57.10%
Joint Venture \| Vornado Capital Partners Real Estate Fund
Investment Holdings
Equity method ownership percentage				64.70%
Joint Venture \| Vornado Realty Trust
Investment Holdings
Equity method ownership percentage				30.30%
Joint Venture \| Third Party
Investment Holdings
Equity method ownership percentage				5.00%
State and Local Jurisdiction \| One Park Avenue
Investment Holdings
Additional real estate tax expense		$ 9,491,000
Interest on real estate transfer tax		6,764,000
Real estate transfer tax and interest		15,608,000
(Loss) income from real estate fund investments		10,630,000
Our share of net income (loss)		$ 4,978,000
Interest Rate Cap \| Loans Due May 2020 \| Crowne Plaza Times Square Hotel Joint Venture \| LIBOR
Investment Holdings
Spread Over LIBOR (in percentage)	4.00%