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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) tenant shares | Jun. 30, 2020 | Sep. 30, 2020 USD ($) segment tenant shares | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |
Limited Partners' Capital Account, Units Outstanding | shares | 55,718,144 |  | 55,718,144 |  |
Deferral Of Actual Rent, Percentage | 2 | 4 |  |  |
Percentage Of Rent Collection | 97 | 92 |  |  |
Cash in Excess of FDIC Insured Amounts | $ 15,500 |  | $ 15,500 | $ 40,900 |
Straight-line rent receivables | $ 27,600 |  | $ 27,600 | 23,000 |
Lessor, Operating Lease, Assumptions and Judgments, Number Of Tenants, Collections No Longer Probable | tenant | 5 |  | 5 |  |
Number of Reportable Segments | segment |  |  | 1 |  |
Right of use assets | $ 40,000 |  | $ 40,000 |  |
Lease liabilities | 15,907 |  | 15,907 |  |
ASU 2016-02 [Member] | Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Right of use assets |  |  |  |  | $ 7,500
Lease liabilities |  |  |  |  | $ 7,500
Unbilled Revenues [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accounts Receivable, Gross | $ 3,100 |  | $ 3,100 | $ 2,600 |
Building [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 40 years |  |
Building Improvements [Member] | Minimum [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |
Building Improvements [Member] | Maximum [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 20 years |  |
Agree Realty Corporation [Member] | General Partner [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage of Operating Partnership Owned |  |  | 99.40% | 99.20% |
Agree Realty Corporation [Member] | Third party [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Non controlling interest |  |  | 0.60% | 0.80% |

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