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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Land	$ 2,525	$ 393
Buildings	5,837	1,857
Lease Intangibles	(458)	557
Real Estate Held-for-sale,Gross	7,904	2,807
Accumulated depreciation and amortization	(208)	(387)
Real Estate Held-for-sale	$ 7,696	$ 2,420

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:	debit
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

- 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 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

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_RealEstateHeldforsale
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant