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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Apr. 30, 2022
Jun. 30, 2021
Document Type 10-K/A    
Document Annual Report true    
Document Transition Report false    
Entity File Number 1-8625    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Entity Registrant Name Reading International, Inc.    
Entity Incorporation, State or Country Code NV    
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    
Entity Central Index Key 0000716634    
Entity Filer Category Non-accelerated Filer    
ICFR Auditor Attestation Flag true    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 124,342,409
Documents Incorporated by Reference Documents Incorporated by Reference

None.

    
Auditor Firm ID 248    
Auditor Location Los Angeles, CA    
Auditor Name Grant Thornton LLP    
Class A [Member]      
Title of 12(b) Security Class A Nonvoting Common Stock, $0.01 Par Value    
Trading Symbol RDI    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   20,363,234  
Class B [Member]      
Title of 12(b) Security Class B Voting Common Stock, $0.01 Par Value    
Trading Symbol RDIB    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   1,680,590