| Document and Entity Information | Sep. 07, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001810739 |
| Document Type | 8-K |
| Document Period End Date | Sep. 7, 2021 |
| Entity Registrant Name | Radius Global Infrastructure, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-39568 |
| Entity Tax Identification Number | 98-1524226 |
| Entity Address, Address Line One | 660 Madison Avenue |
| Entity Address, Address Line Two | Suite 1435 |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10065 |
| City Area Code | (610) |
| Local Phone Number | 660-4910 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, par value $0.0001 per share |
| Trading Symbol | RADI |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
