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Cover Page
Nov. 03, 2025
Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Nov. 03, 2025
Entity Registrant Name DIVERSIFIED HEALTHCARE TRUST
Entity Incorporation, State or Country Code MD
Entity File Number 001-15319
Entity Tax Identification Number 04-3445278
Entity Address, Address Line One Two Newton Place, 255 Washington Street, Suite 300
Entity Address, City or Town Newton
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02458-1634
City Area Code 617
Local Phone Number 796-8350
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Shares of Beneficial Interest
Trading Symbol DHC
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001075415
Amendment Flag false
Senior Notes Due 2046  
Entity Information [Line Items]  
Title of 12(b) Security 6.25% Senior Notes due 2046
Trading Symbol DHCNL
Security Exchange Name NASDAQ
Senior Notes Due 2042  
Entity Information [Line Items]  
Title of 12(b) Security 5.625% Senior Notes due 2042
Trading Symbol DHCNI
Security Exchange Name NASDAQ