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EQUITY AND NONCONTROLLING INTEREST (Details)								3 Months Ended		4 Months Ended	9 Months Ended
	Aug. 04, 2017 USD ($) $ / shares shares	May 25, 2017 $ / shares shares	May 25, 2017 $ / shares shares	May 24, 2017 shares	May 10, 2017 USD ($) shares	Jan. 04, 2017 $ / shares shares	Jan. 15, 2015	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares	Aug. 08, 2016 USD ($) $ / shares
Noncontrolling Interest [Line Items]
Common stock, par value (in dollars per share) | $ / shares								$ 0.01		$ 0.01	$ 0.01
Proceeds from issuance of common shares | $											$ 348,214,000	$ 5,020,000
Sale of Stock, Price Per Share | $ / shares	$ 24.80
Distributions to redeemable NCI (in dollars per unit) | $ / shares								$ 0.22	$ 0.20			$ 0.60
Common limited partnership units issued (in shares) | shares								5,700,000			5,700,000
Noncontrolling interest percentage								10.27454%			8.98167%
Conversion rate to common shares											1
LTIP Units
Noncontrolling Interest [Line Items]
Award vesting period											2 years
Retained Earnings [Member]
Noncontrolling Interest [Line Items]
Common Stock, Dividends, Per Share, Declared | $ / shares											$ 0.66
Vornado
Noncontrolling Interest [Line Items]
Noncontrolling interest percentage							5.40%				89.90%
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Noncontrolling interest percentage							5.00%
Yonkers Gateway Center
Noncontrolling Interest [Line Items]
Business acquisition, equity interest issued or issuable, units (in shares) | shares						1,800,000
Business acquisition, unit price (in dollars per share) | $ / shares						$ 27.09
Ackerman Portfolio
Noncontrolling Interest [Line Items]
Business acquisition, equity interest issued or issuable, units (in shares) | shares		4,500,000	1,900,000	2,600,000
Business acquisition, unit price (in dollars per share) | $ / shares		$ 27.02	$ 27.02
ATM
Noncontrolling Interest [Line Items]
Common stock, par value (in dollars per share) | $ / shares													$ 0.01
Aggregate shares subscription price | $													$ 250,000,000
Common stock remaining amount available for issuance | $								$ 241,300,000			$ 241,300,000
Common shares issued during period (in shares) | shares								0	0	307,342	0
Weighted average price per share issued (in dollars per share) | $ / shares										$ 28.45
Proceeds from issuance of common shares | $										$ 8,700,000
Commissions paid to distribution agencies | $										100,000
Payments of Stock Issuance Costs | $										$ 400,000
Underwritten Public Offering
Noncontrolling Interest [Line Items]
Proceeds from issuance of common shares | $	$ 155,000,000				$ 193,500,000
Payments of Stock Issuance Costs | $	$ 1,300,000
Sale of stock, number of shares issued (in shares) | shares	6,250,000				7,700,000

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