MORTGAGES AND OTHER NOTES PAYABLE Unsecured Credit Facilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Line of Credit Facility [Line Items]
Mortgage and other notes payable	$ 1,130,481,000		$ 1,039,997,000
Total amount of credit facility	300,000,000
Amount borrowed	77,100,000		68,750,000
Net borrowings (repayments) during the year ended December 31, 2014	8,350,000
Letters of credit outstanding as of December 31, 2014	12,500,000
Amount available under credit facilities as of December 31, 2014	210,400,000
Acadia Realty, LP [Member]
Line of Credit Facility [Line Items]
Total amount of credit facility	150,000,000
Amount borrowed	0		0
Net borrowings (repayments) during the year ended December 31, 2014	0
Letters of credit outstanding as of December 31, 2014	12,500,000
Amount available under credit facilities as of December 31, 2014	137,500,000
Fund IV [Member]
Line of Credit Facility [Line Items]
Total amount of credit facility	150,000,000
Amount borrowed	77,100,000		68,750,000
Net borrowings (repayments) during the year ended December 31, 2014	8,350,000
Letters of credit outstanding as of December 31, 2014	0
Amount available under credit facilities as of December 31, 2014	72,900,000
Unsecured Debt [Member] | Fund IV [Member]
Line of Credit Facility [Line Items]
Mortgage and other notes payable	77,100,000	[1]	68,750,000	[1]
Unsecured Debt [Member] | LIBOR [Member] | Fund IV [Member]
Line of Credit Facility [Line Items]
Borrowings, interest rate basis spread	1.65%
Unsecured Debt [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Mortgage and other notes payable	0		0
Unsecured Debt [Member] | Line of Credit [Member] | LIBOR [Member]
Line of Credit Facility [Line Items]
Borrowings, interest rate basis spread	1.40%
Unsecured Debt [Member] | Unsecured Credit Facility [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Proceeds from lines of credit	15,000,000
Repayments of debt	15,000,000
Amount borrowed	0
Unsecured Debt [Member] | Unsecured Credit Facility [Member] | Line of Credit [Member] | LIBOR [Member] | January 31, 2016
Line of Credit Facility [Line Items]
Borrowings, interest rate basis spread	1.55%
Unused capacity fee percentage	0.35%
Unsecured Debt [Member] | Unsecured Credit Facility [Member] | Line of Credit [Member] | LIBOR [Member] | January 31, 2018
Line of Credit Facility [Line Items]
Borrowings, interest rate basis spread	1.40%
Unused capacity fee percentage	0.25%
Unsecured Debt [Member] | Unsecured Credit Facility [Member] | Line of Credit [Member] | LIBOR [Member] | November 25, 2018
Line of Credit Facility [Line Items]
Borrowings, interest rate basis spread	1.40%
Unsecured Debt [Member] | Unsecured Credit Facility [Member] | Line of Credit [Member] | LIBOR [Member] | November 25, 2019
Line of Credit Facility [Line Items]
Borrowings, interest rate basis spread	1.30%
Unsecured Debt [Member] | Unsecured Credit Facility, Term Loan [Member]
Line of Credit Facility [Line Items]
Mortgage and other notes payable	50,000,000
Unsecured Debt [Member] | Unsecured Credit Facility, Term Loan [Member] | November 25, 2018
Line of Credit Facility [Line Items]
Mortgage and other notes payable	50,000,000
Line of Credit [Member] | Subscription Line [Member] | Line of Credit [Member] | Fund IV [Member]
Line of Credit Facility [Line Items]
Repayments of debt	103,900,000
Borrowings, amount	112,200,000.0
Mortgage and other notes payable	$ 77,100,000

[1] The Fund IV revolving subscription line of credit is secured by unfunded investor capital commitments.