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Business and Property Management Agreements with RMR (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) employee	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) employee agreement	Sep. 30, 2021 USD ($)
Related person transactions
Number of employees | employee	0		0
Property management and construction supervision fees	$ 2,658	$ 2,931	$ 7,567	$ 9,276
Property management and construction supervision fees paid	3,498	3,121	9,573	9,620
RMR
Related person transactions
Business management fees incurred	3,763	5,986	$ 13,082	17,627
Period of actual amount of incentive fees			3 years
Property management and construction supervision fees	1,521	2,410	$ 4,142	7,360
Party transaction property management and construction supervision fees capitalized	$ 1,137	$ 521	$ 3,425	$ 1,916
Property management fee	3.00%		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

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

X

- Details

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

X

- Details

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