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Senior Living Community Management Agreements - Narrative (Details) - Affiliated Entity $ in Thousands	3 Months Ended
	Mar. 31, 2025 USD ($) community	Mar. 31, 2024 USD ($) community
Five Star
Property management agreement expense	$ 11,234	$ 10,407
Related party transaction capitalized amount	595	409
Five Star | Operating Expense
Property management agreement expense	$ 10,639	$ 9,998
Senior Living Communities | Five Star
Number of communities managed | community	118	119
Senior Living Communities | Third Party Managers
Number of communities managed | community	113	111
Property management agreement expense	$ 6,334	$ 5,725
Incentive fee expense	$ 351	$ 0

X

- Definition

Represents the number of communities managed by a related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	dhc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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
Period Type:	duration

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

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Namespace Prefix:	dhc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of expense for incentive fee based on performance under arrangement to manage operations, including, but not limited to, investment.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 850
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

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Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OperatingExpenseMember
Namespace Prefix:
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X

- Details

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

X

- Details

Name:	srt_CounterpartyNameAxis=dhc_ThirdPartyManagersMember
Namespace Prefix:
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