Document and Entity Information - shares shares in Millions	3 Months Ended
	Mar. 31, 2023	May 08, 2023
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Entity Registrant Name	Strategic Student & Senior Housing Trust, Inc.
Entity Central Index Key	0001698538
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Small Business	true
Entity Ex Transition Period	true
Entity File Number	333-220646
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	81-4112948
Entity Address, Address Line One	19900 MacArthur Blvd
Entity Address, Address Line Two	Suite 250
Entity Address, City or Town	Irvine
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92612
City Area Code	877
Local Phone Number	327-3485
Document Quarterly Report	true
Document Transition Report	false
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11.6
Class T Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0.1
Class W Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0.1
Class Y Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		1.1
Class Z Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		0.2