MORTGAGES PAYABLE Secured Credit Facilities (Details) (USD $)	12 Months Ended			12 Months Ended				12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jan. 31, 2013 Revolving Credit Facility [Member] Unsecured Debt [Member] Subsequent Event [Member]	Dec. 31, 2012 Acadia Realty, LP [Member]		Dec. 31, 2011 Acadia Realty, LP [Member]		Dec. 31, 2012 Fund II [Member]	Dec. 31, 2011 Fund II [Member]	Dec. 31, 2012 Fund III [Member]	Dec. 31, 2011 Fund III [Member]	Dec. 31, 2012 Fund IV [Member]	Dec. 31, 2011 Fund IV [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Face Amount			$ 150,000,000
Total amount of credit facility	214,498,000			64,498,000	[1]			0		0		150,000,000
Amount borrowed	93,050,000	177,079,000		0	[1]	1,000,000	[1]	0	40,000,000	0	136,079,000	93,050,000	0
Net borrowings (repayments) during the year ended December 31, 2012	(84,029,000)			(1,000,000)	[1]			(40,000,000)		(136,079,000)		93,050,000
Letters of credit outstanding as of December 31, 2012	0			0	[1]			0		0		0
Amount available under credit facilities as of December 31, 2012	$ 121,448,000			$ 64,498,000	[1]			$ 0		$ 0		$ 56,950,000

[1] Subsequent to December 31, 2012, the Company closed on a new $150.0 million unsecured credit facility, which replaced this maturing secured credit facility.