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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% |

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