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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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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% |  |

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