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Business and Property Management Agreements with RMR-Schedule of Business Management Fees, Property Management Fees and Construction Supervision Fees Recognized (Details) - RMR LLC - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pursuant to business management agreement: |  |  |  |
Business management fees | $ 3,967 | $ 3,977 | $ 11,517 | $ 12,321
Incentive management fees | 5,676 | 6,934 | 12,231 | 6,934
Total | 9,643 | 10,911 | 23,748 | 19,255
Pursuant to property management agreement |  |  |  |
Property management fees | 1,199 | 1,358 | 3,643 | 4,342
Construction supervision fees | 341 | 429 | 775 | 1,069
Total | 1,540 | 1,787 | 4,418 | 5,411
Expense Reimbursement [Abstract] |  |  |  |
Property level expenses | 3,085 | 3,925 | 10,144 | 11,202
Other reimbursed expenses | 50 | 82 | 150 | 246
Total | 3,135 | 4,007 | 10,294 | 11,448
Recognized amortization of the liability | 743 | 743 | 2,229 | 2,229
Amortization of liability related to property management and construction supervision fees | $ 199 | $ 199 | $ 597 | $ 597

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- Definition Amortization Of Liability Related To Property Management And Construction Supervision Fees + 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 Business Management Fees + References No definition available. + Details
Name: | dhc_BusinessManagementFees
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Business Management Fees and Incentive Management Fees, Net + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Construction Supervision Fees + References No definition available. + Details
Name: | dhc_ConstructionSupervisionFees
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Expense Reimbursement + References No definition available. + Details
Name: | dhc_ExpenseReimbursementAbstract
Namespace Prefix: | dhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Other Reimbursed Expenses + References No definition available. + Details
Name: | dhc_OtherReimbursedExpenses
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Property Level And Other Reimbursed Expenses, Net + References No definition available. + Details
Name: | dhc_PropertyLevelAndOtherReimbursedExpensesNet
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Property Level Expenses Reimbursed + References No definition available. + Details
Name: | dhc_PropertyLevelExpensesReimbursed
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Pursuant To Business Management Agreement + References No definition available. + Details
Name: | dhc_PursuantToBusinessManagementAgreementAbstract
Namespace Prefix: | dhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Pursuant To Property Management Agreement + References No definition available. + Details
Name: | dhc_PursuantToPropertyManagementAgreementAbstract
Namespace Prefix: | dhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of amortization of the liability recorded during the period. + References No definition available. + Details
Name: | dhc_TransactionAmortizationOfLiability
Namespace Prefix: | dhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |