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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) tenant property shares | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2020 USD ($) tenant property segment shares | Dec. 31, 2019 USD ($) property | Jan. 01, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |
Outstanding units | shares |  | 60,369,102 |  |  | 60,369,102 |  |
Percentage of deferral rent |  |  | 2 | 2 |  |  |
Percentage of rent collected |  | 99 | 98 | 95 |  |  |
Number of real estate properties held-for-sale | property |  | 1 |  |  | 1 | 1 |
Cash in Excess of FDIC Insured Amounts |  | $ 7,000 |  |  | $ 7,000 | $ 40,900 |
Straight-line rent receivables |  | $ 29,800 |  |  | $ 29,800 | 23,000 |
Number of tenants for whom, collections no longer probable | tenant |  | 6 |  |  | 6 |  |
Number of Reportable Segments | segment |  |  |  |  | 1 |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  | Other Assets |  |  | Other Assets |  |
Right of use assets |  | $ 44,500 |  |  | $ 44,500 |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  | Accounts Payable and Accrued Liabilities |  |  | Accounts Payable and Accrued Liabilities |  |
Operating Lease, Liability |  | $ 16,867 |  |  | $ 16,867 |  |
Operating Lease Liability, Before Depreciation |  | 17,300 |  |  | 17,300 |  |
ASU 2016-02 [Member] | Restatement |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Right of use assets |  |  |  |  |  |  | $ 7,500
Operating Lease, Liability |  |  |  |  |  |  | $ 7,500
Unbilled Revenues [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Accounts Receivable, Gross |  | $ 4,100 |  |  | $ 4,100 | $ 2,600 |
General and Administrative Expense |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
One-time extension bonus | $ 1,500 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of deferral rent |  | 1 |  |  |  |  |
Building [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life |  |  |  |  | 40 years |  |
Building Improvements [Member] | Minimum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life |  |  |  |  | 10 years |  |
Building Improvements [Member] | Maximum [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life |  |  |  |  | 20 years |  |
Agree Realty Corporation [Member] | General Partner [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Operating partnership owned percentage |  |  |  |  | 99.40% | 99.20% |
Agree Realty Corporation [Member] | Third party [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Non controlling interest |  |  |  |  | 0.60% | 0.80% |
President And Chief Executive Officer [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Agreement Auto Renewal Period | 2 years |  |  |  |  |  |
Agreement Non Renewal, Notice Period | 60 days |  |  |  |  |  |

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