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v3.22.1

Business and Property Management Agreements with RMR (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) employee agreement | Mar. 31, 2021 USD ($) | Dec. 31, 2021
Related person transactions |  |  |
Number of employees | employee | 0 |  |
Related party transaction business management agreement, annual incentive fee estimate included in management fees | $ 0 | $ 0 |
Property management and construction supervision fees | 2,391,000 | 3,154,000 |
Property management and construction supervision fees paid | 2,964,000 | 3,297,000 |
RMR |  |  |
Related person transactions |  |  |
Business management fees incurred | 4,813,000 | 5,317,000 |
Related party transaction business management agreement, annual incentive fee estimate included in management fees | 0 | 0 |
Period of actual amount of incentive fees |  |  | 3 years
Property management and construction supervision fees | 1,349,000 | 2,485,000 |
Party transaction property management and construction supervision fees capitalized | $ 1,042,000 | $ 669,000 |
Property management fee | 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

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- Definition Business Management Agreement Annual Incentive Fee Estimate Included in Management Fees + References No definition available. + Details
Name: | dhc_BusinessManagementAgreementAnnualIncentiveFeeEstimateIncludedInManagementFees
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- 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

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

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