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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Pursuant to business management agreement: |  |  |  |
Business management fees | $ 3,741 | $ 3,977 | $ 7,550 | $ 8,006
Incentive management fees | 4,148 | (849) | 6,555 | 0
Total | 7,889 | 3,128 | 14,105 | 8,006
Pursuant to property management agreement |  |  |  |
Property management fees | 1,192 | 1,446 | 2,456 | 2,984
Construction supervision fees | 208 | 274 | 434 | 640
Total | 1,400 | 1,720 | 2,890 | 3,624
Expense Reimbursement [Abstract] |  |  |  |
Property level expenses | 3,318 | 3,631 | 7,059 | 7,277
Other reimbursed expenses | 50 | 82 | 100 | 164
Total | 3,368 | 3,713 | 7,159 | 7,441
Recognized amortization of the liability | 743 | 743 | 1,487 | 1,487
Amortization of liability related to property management and construction supervision fees | $ 199 | $ 199 | $ 398 | $ 398

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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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Namespace Prefix: | dhc_
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
Name: | dhc_PropertyManagementAndConstructionSupervisionFeesNet
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: |