Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to Reading International, Inc. common stockholders	$ (2,081)	$ 3,082
Weighted average number of common stock – basic	22,920,486	22,967,237
Weighted average dilutive impact of awards	203,620	165,752
Weighted average number of common stock – diluted	23,124,106	23,132,989
Basic earnings (loss) per share attributable to RDI common stockholders	$ (0.09)	$ 0.13
Diluted earnings (loss) per share attributable to RDI common stockholders	$ (0.09)	$ 0.13
Awards excluded from diluted earnings (loss) per share	496,089