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Senior Living Community Management Agreements - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) community	Sep. 30, 2023 USD ($) community
Property operating expenses	$ 309,697	$ 298,432	$ 921,366	$ 870,740
Affiliated Entity | Five Star
Property management agreement expense	10,611	10,058	31,462	29,962
Related party transaction capitalized amount	551	601	1,409	2,053
Affiliated Entity | Five Star | Rehabilitation Services
Property operating expenses			0	1,213
Affiliated Entity | Five Star | Operating Expense
Property management agreement expense	10,060	9,457	$ 30,053	$ 27,909
Senior Living Communities | Affiliated Entity | Five Star
Number of communities managed | community			119	119
Senior Living Communities | Affiliated Entity | Third Party Managers
Number of communities managed | community			111	111
Property management agreement expense	$ 5,858	$ 5,635	$ 17,341	$ 16,230
Termination and other fees			$ 2,042

X

- Definition

Represents the number of communities managed by a related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	dhc_
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X

- Definition

Payments For Termination And Other Fees

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Related Party Transaction Capitalized Amount

+ References

No definition available.

+ Details

Name:	dhc_RelatedPartyTransactionCapitalizedAmount
Namespace Prefix:	dhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Expenses recognized during the period resulting from property management transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

+ References

No definition available.

+ Details

Name:	dhc_RelatedPartyTransactionExpensesFromPropertyManagementAgreementTransactionsWithRelatedParty
Namespace Prefix:	dhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingCostsAndExpenses
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X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=dhc_FiveStarQualityCareIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dhc_RehabilitationServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OperatingExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=dhc_SeniorLivingCommunityMember
Namespace Prefix:
Data Type:	na
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X

- Details

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