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Summary of Significant Accounting Policies - Real Estate Properties (Details) $ in Thousands | Dec. 31, 2019 USD ($)
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Summary of Significant Accounting Policies |
Land | $ 2,269
Buildings | 2,315
Real Estate Held-for-sale, Gross | 4,584
Accumulated depreciation and amortization | (834)
Total Real Estate Held for Sale, net | $ 3,750

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