| Document And Entity Information | Nov. 09, 2021 |
| Document Type | 8-K |
| Document Period End Date | Nov. 9, 2021 |
| Entity Registrant Name | Reading International, Inc. |
| Entity Incorporation, State or Country Code | NV |
| Entity File Number | 1-8625 |
| Entity Tax Identification Number | 95-3885184 |
| Entity Address, Address Line One | 189 Second Avenue |
| Entity Address, Address Line Two | Suite 2S |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10003 |
| City Area Code | 213 |
| Local Phone Number | 235-2240 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000716634 |
| Amendment Flag | false |
| Class A Non-Voting Common Stock [Member] | |
| Title of 12(b) Security | Class A Common Stock, $0.01 par value |
| Trading Symbol | RDI |
| Security Exchange Name | NASDAQ |
| Class B Voting Common Stock [Member] | |
| Title of 12(b) Security | Class B Common Stock, $0.01 par value |
| Trading Symbol | RDIB |
| Security Exchange Name | NASDAQ |
