Earnings Per Share (Computation Of Basic And Diluted Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to Reading International, Inc.	$ (4,400)	$ (5,177)	$ (18,289)	$ (22,967)
Weighted average number of common stock – basic	22,273,423	22,043,823	22,208,757	22,011,755
Weighted average number of common stock – diluted	22,273,423	22,043,823	22,208,757	22,011,755
Basic earnings (loss) per share	$ (0.20)	$ (0.23)	$ (0.82)	$ (1.04)
Diluted earnings (loss) per share	$ (0.20)	$ (0.23)	$ (0.82)	$ (1.04)
Awards excluded from diluted earnings (loss) per share	205,122	911,732	205,122	911,732