Organization, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)		9 Months Ended	12 Months Ended
	Jan. 01, 2019 USD ($)	Sep. 30, 2019 USD ($) property segment	Dec. 31, 2018 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Limited partnership to common stock conversion ratio		100.00%
Number of retail properties | property		182
Number of reportable segments | segment		3
Capitalized internal leasing costs			$ 1,800,000
Operating lease, right-of-use asset		$ 55,717,000
Operating lease, liability		12,800,000
Finance lease, right-of-use asset		93,796,000
Finance lease, liability		88,137,000
Accounting Standards Update 2016-02
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Leases, future payment obligations			$ 203,100
Operating lease, right-of-use asset		11,900,000
Finance lease, right-of-use asset		5,700,000
Finance lease, liability		5,700,000
Present value of lease purchase options	$ 4,700,000
Capital Lease Liability
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Finance lease, liability		71,100,000
Capital Leases Asset
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Finance lease, right-of-use asset		$ 77,000,000.0
Core Portfolio
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of retail properties | property		125
Properties owned percentage		100.00%
Opportunity Funds
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of retail properties | property		57
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		94.00%	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%