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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Apr. 16, 2021
Jun. 30, 2020
Document Type 10-K/A    
Document Annual Report true    
Document Transition Report false    
Entity File Number 1-8625    
Amendment Flag true    
Amendment Description EXPLANATORY NOTE This Amendment No. 1 on Form 10-K/A (this "Form 10-K/A") amends our Annual Report on Form 10-K for the fiscal year ended December 31, 2020, originally filed with the U.S. Securities and Exchange Commission (the "SEC") on March 31, 2021 (the "2020 Form 10-K"). We are filing this Form 10-K/A to include the information required by Items 10 through 14 of Part III that were not included in the 2020 Form 10-K, as we will not file a definitive proxy statement containing such information within 120 days after the end of the fiscal year ended December 31, 2020, the end of the fiscal year covered by our 2020 Form 10-K. Our board of directors has not yet set a date for the Company's Annual Meeting of Stockholders (the "Annual Meeting"). This Form 10-K/A amends and restates in their entirety the cover page, Items 10 through 14 of Part III and the Exhibit Index (including the filing of new certifications as required by Section 302 of the Sarbanes-Oxley Act of 2002, as amended (the "Sarbanes-Oxley Act") in accordance with Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act") of the 2020 Form 10-K). Except as otherwise expressly noted above, this Form 10-K/A does not amend any other information set forth in the 2020 Form 10-K. This Form 10-K/A continues to speak as of the date of the 2020 Form 10-K and, except where expressly noted, we have not updated disclosures contained herein or therein to reflect any events that occurred at a date subsequent to the date of the 2020 Form 10-K. Accordingly, this Form 10-K/A should be read in conjunction with the 2020 Form 10-K and our other filings with the SEC. Because no financial statements have been included in this Form 10-K/A and this Form 10-K/A does not contain or amend any disclosure with respect to Item 307 or Item 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications required by Section 302 of the Sarbanes-Oxley Act have been omitted. Unless the context requires otherwise, all references to the "Company," "Reading," “we,” “our” or “us” means Reading International, Inc., a Nevada corporation, and its consolidated subsidiaries.    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
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 5995 Sepulveda Blvd    
Entity Address, Address Line Two Suite 300    
Entity Address, City or Town Culver City    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90230    
City Area Code 213    
Local Phone Number 235-2240    
Entity Central Index Key 0000716634    
Current Fiscal Year End Date --12-31    
Entity Filer Category 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     $ 75,993,611
Documents Incorporated by Reference Documents Incorporated by Reference

None.

    
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   20,129,029  
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