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v3.21.2

Real Estate Properties - Schedule of Real Estate Properties (Details) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2021 USD ($) ft² property | Feb. 28, 2021 USD ($) ft² property | Jun. 30, 2021 USD ($) property
Real Estate |  |  |
Number of properties (property) | property |  |  | 392
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |
Real Estate |  |  |
Number of properties (property) | property |  |  | 5
Sales Price |  |  | $ 104,500
Gain (Loss) on Sale |  |  | $ 30,638
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Medical Office | Pennsylvania |  |  |
Real Estate |  |  |
Number of properties (property) | property |  | 1 |
Square Feet | ft² |  | 92,000 |
Sales Price |  | $ 9,000 |
Gain (Loss) on Sale |  | $ (122) |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Life Science and Medical Office | Florida |  |  |
Real Estate |  |  |
Number of properties (property) | property | 4 |  |
Square Feet | ft² | 263,656 |  |
Sales Price | $ 95,500 |  |
Gain (Loss) on Sale | $ 30,760 |  |

X
- Definition This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity. + References No definition available. + Details
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Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=dhc_MedicalOfficeBuildingMember
Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=stpr_PA
Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=stpr_FL
Namespace Prefix: |
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Balance Type: |
Period Type: |