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Summary of Significant Accounting Policies - Real Estate Properties (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Land	$ 1,104
Buildings	2,043
Real Estate Held-for-sale, Gross	3,147
Accumulated depreciation and amortization	(1,073)
Total Real Estate Held for Sale, net	$ 2,074

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