| Document and Entity Information | Aug. 31, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | Strategic Student & Senior Housing Trust, Inc. |
| Document Type | 8-K |
| Amendment Flag | false |
| Entity Central Index Key | 0001698538 |
| Document Period End Date | Aug. 31, 2021 |
| Entity Emerging Growth Company | 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 | 10 Terrace Road |
| Entity Address, City or Town | Ladera Ranch |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92694 |
| City Area Code | 877 |
| Local Phone Number | 327-3485 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
