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v3.22.2.2

Business and Property Management Agreements with RMR (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 USD ($) employee | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) employee agreement | Sep. 30, 2021 USD ($)
Related person transactions |  |  |  |
Number of employees | employee | 0 |  | 0 |
Property management and construction supervision fees | $ 2,658 | $ 2,931 | $ 7,567 | $ 9,276
Property management and construction supervision fees paid | 3,498 | 3,121 | 9,573 | 9,620
RMR |  |  |  |
Related person transactions |  |  |  |
Business management fees incurred | 3,763 | 5,986 | $ 13,082 | 17,627
Period of actual amount of incentive fees |  |  | 3 years |
Property management and construction supervision fees | 1,521 | 2,410 | $ 4,142 | 7,360
Party transaction property management and construction supervision fees capitalized | $ 1,137 | $ 521 | $ 3,425 | $ 1,916
Property management fee | 3.00% |  | 3.00% |
Senior Living Communities | RMR |  |  |  |
Related person transactions |  |  |  |
Number of consecutive renewal terms of agreement | agreement |  |  | 2 |

X
- Definition Number of persons employed by the Entity + References No definition available. + Details
Name: | dei_EntityNumberOfEmployees
Namespace Prefix: | dei_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the business management fees incurred pursuant to business management agreement with related parties. + References No definition available. + Details
Name: | dhc_BusinessManagementFees
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period Of Actual Amount Of Incentive Fees + References No definition available. + Details
Name: | dhc_PeriodOfActualAmountOfIncentiveFees
Namespace Prefix: | dhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the property management and construction supervision fees incurred pursuant to business and property management agreements with related parties. + References No definition available. + Details
Name: | dhc_PropertyManagementAndConstructionSupervisionFees
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Property Management And Construction Supervision Fees, Capitalized + References No definition available. + Details
Name: | dhc_PropertyManagementAndConstructionSupervisionFeesCapitalized
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the property management and construction supervision fees paid to related parties. + References No definition available. + Details
Name: | dhc_PropertyManagementAndConstructionSupervisionFeesPaid
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Property Management Fee + References No definition available. + Details
Name: | dhc_PropertyManagementFee
Namespace Prefix: | dhc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of consecutive renewal terms of agreement that the entity has the option to renew. + References No definition available. + Details
Name: | dhc_RelatedPartyTransactionPropertyManagementAgreementNumberOfConsecutiveRenewalTerms
Namespace Prefix: | dhc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=dhc_ReitManagementAndResearchMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=dhc_SeniorLivingCommunityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |