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Summary of Significant Accounting Policies - Real Estate Properties (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Summary of Significant Accounting Policies |  |
Land | $ 974 | $ 313
Building | 3,973 | 1,019
Lease intangibles - asset | 1,792 | 132
Lease intangibles - (liability) | 0 | (285)
Real Estate Held-for-sale, gross | 6,739 | 1,179
Accumulated depreciation and amortization, net | (1,168) | 20
Total Real Estate Held for Sale, net | $ 5,571 | $ 1,199

X
- Definition The cumulative amount of depreciation for real estate property held for sale. + References No definition available. + Details
Name: | adc_RealEstateHeldForSaleAccumulatedDepreciation
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gross amount as of investments in buildings held for sale, excluding real estate considered to be inventory of the entity. + References No definition available. + Details
Name: | adc_RealEstateHeldForSaleBuilding
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross amount as of investments in land, buildings and lease intangibles held for sale, excluding real estate considered to be inventory of the entity. + References No definition available. + Details
Name: | adc_RealEstateHeldForSaleGross
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross amount as of investments in land held for sale, excluding real estate considered to be inventory of the entity. + References No definition available. + Details
Name: | adc_RealEstateHeldForSaleLand
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross amount as of investments in lease intangibles held for sale, excluding real estate considered to be inventory of the entity. + References No definition available. + Details
Name: | adc_RealEstateHeldForSaleLeaseIntangibles
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Gross amount as of investments in lease liabilities held for sale, excluding real estate considered to be inventory of the entity. + References No definition available. + Details
Name: | adc_RealEstateHeldForSaleLeaseLiability
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of real estate investments, net of accumulated depreciation . + References No definition available. + Details
Name: | adc_RealEstateHeldForSaleNetTotal
Namespace Prefix: | adc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration