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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Land | $ 271 | $ 393
Buildings | 1,087 | 1,857
Lease Intangibles (Asset) | 290 | 557
Real Estate Held-for-sale, Gross | 1,648 | 2,807
Accumulated depreciation and amortization | (281) | (387)
Total Real Estate Held for Sale | $ 1,367 | $ 2,420

X
- Definition The cumulative amount of depreciation for real estate property held for sale. + References No definition available. + Details
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Balance Type: | debit
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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
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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
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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
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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://fasb.org/us-gaap/role/ref/legacyRef -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
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