Organization, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) property segment	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Limited partnership to common stock conversion ratio	100.00%
Number of retail properties	187
Number of reportable segments | segment	3
Credit loss allowance | $	$ 0.5
Core Portfolio
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of retail properties	131
Properties owned percentage	100.00%
Opportunity Funds
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of retail properties	56
Structured Financing | ASU 2016-13
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Cumulative effect adjustment to accumulated earnings | $	$ 0.4
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%
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%	95.00%
Institutional Investors
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Remaining funds rate of distribution to all partners (in percent)	80.00%