Organization, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) property Portfolio Tenant $ / shares	Sep. 30, 2020	Dec. 31, 2020 USD ($) property Agreement Store segment $ / shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Limited partnership to common stock conversion ratio			100.00%
Common shares of beneficial interest, par value | $ / shares	$ 0.001		$ 0.001	$ 0.001
Number of retail properties | property	187		187
Number of sores having bankruptcies, in core portfolio | Store			4
Core portfolio annualized base rents for stores of bankruptcies			$ 1,200,000
Core portfolio annualized base rents for stores of bankruptcies percentage			0.90%
Number of sores having bankruptcies, in fund portfolio | Store			6
Fund portfolio annualized base rents for stores of bankruptcies			$ 100,000
Fund portfolio annualized base rents for stores of bankruptcies percentage			0.70%
Number of core portfolio | Portfolio	5
Number of fund tenants | Tenant	11
Number of reportable segments | segment			3
Amount of goodwill recorded and acquisition costs capitalized			$ 0
Deferred Rent Receivables, Net	$ 41,400,000		41,400,000	$ 48,400,000
Allowance for doubtful accounts receivable	45,400,000		45,400,000	11,400,000
Allowance for doubtful accounts receivable adjustments.			46,800,000	4,400,000	$ 2,500,000
Net operating losses carried back, CARES Act			3,100,000
Tax refund on net operating loss carried back, CARES Act			1,000,000.0
Distributions in excess of accumulated earnings	(167,046,000)		(167,046,000)	$ (132,961,000)
Credit loss allowance	$ 300,000		$ 300,000
ASU 2016-13
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Change in accounting principle, adopted	true		true
Change in accounting principle, adoption date	Jan. 01, 2020		Jan. 01, 2020
ASU 2018-19
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Change in accounting principle, adopted	true		true
Change in accounting principle, adoption date	Jan. 01, 2020		Jan. 01, 2020
Change in accounting principle, immaterial effect	true		true
ASU 2019-04
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Change in accounting principle, adopted	true		true
Change in accounting principle, adoption date	Jan. 01, 2020		Jan. 01, 2020
Change in accounting principle, immaterial effect	true		true
ASU 2018-13
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Change in accounting principle, adopted	true		true
Change in accounting principle, adoption date	Jan. 01, 2020		Jan. 01, 2020
Change in accounting principle, immaterial effect	true		true
ASU 2020-03
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Change in accounting principle, adopted	true		true
Change in accounting principle, adoption date	Jan. 01, 2020		Jan. 01, 2020
Change in accounting principle, immaterial effect	true		true
REIT
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of distribute taxable income			90.00%
Percentage of taxable income.			100.00%
Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of taxable income offset by net operating loss carryforwards			80.00%
Buildings
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Property, plant and equipment, useful life			40 years
Building Improvements
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Property, plant and equipment, useful life			15 years
Furniture and fixtures | Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Property, plant and equipment, useful life			5 years
Furniture and fixtures | Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Property, plant and equipment, useful life			10 years
SBA Paycheck Protection Program
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Borrowings, amount	$ 0		$ 0
COVID-19
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of rent concession agreements | Agreement			288
Number of rent concession agreements for rent deferral | Agreement			226
Number of rent concession agreements for rent abatements | Agreement			60
Number of rent concession agreements accounted as no change in contract | Agreement			217
Allowance for doubtful accounts	2,400,000		$ 2,400,000
Deferred receivables	$ 10,700,000		$ 10,700,000
Pro rata core leased occupancy rate percentage		91.10%	90.90%
Pro rata fund leased occupancy rate percentage		89.80%	88.30%
Core Portfolio
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of retail properties | property	131		131
Properties owned percentage	100.00%		100.00%
Opportunity Funds
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of retail properties | property	56		56
Structured Financing | Cumulative Effect of Change in Accounting Principle | ASU 2016-13
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Distributions in excess of accumulated earnings	$ 400,000		$ 400,000
Operating Partnership, as General Partner or Managing Member
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Remaining funds rate of distribution to operating partnership (in percent)	20.00%		20.00%
Operating Partnership, as General Partner or Managing Member | Acadia's OP Ownership
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Equity interest held by Operating Partnership			95.00%	94.00%
Institutional Investors
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Remaining funds rate of distribution to all partners (in percent)	80.00%		80.00%