Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 05, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	ck0001698538
Entity Registrant Name	Strategic Student & Senior Housing Trust, Inc.
Entity Central Index Key	0001698538
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	true
Entity Small Business	false
Entity Ex Transition Period	true
Class A Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		11,000,000
Class T Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		5,000
Class W Common Stock [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		32,000