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Summary of Significant Accounting Policies - Real Estate Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Summary of Significant Accounting Policies
Land	$ 313	$ 2,269
Building	1,019	2,315
Lease intangibles - asset	132	0
Lease intangibles - (liability)	(285)	0
Real Estate Held-for-sale, gross	1,179	4,584
Accumulated depreciation and amortization, net	20	(834)
Total Real Estate Held for Sale, net	$ 1,199	$ 3,750

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