Non-controlling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Balance			$ (40,407,000)				$ (40,407,000)
Balance	$ 47,566,000	$ 50,972,000	63,279,000	$ 82,227,000	$ 93,494,000	$ 105,060,000	63,279,000	$ 105,060,000
Net income (loss)	(4,465,000)	(2,861,000)	(11,324,000)	(5,299,000)	(2,443,000)	(15,453,000)	(18,650,000)	(23,195,000)
Other comprehensive income, net	(1,660,000)	(741,000)	(1,294,000)	(8,170,000)	(9,217,000)	3,525,000
Share-based compensation expense	614,000	308,000	443,000	497,000	466,000	415,000
Restricted Stock Units		(112,000)	(132,000)		(52,000)	(31,000)
Distributions to noncontrolling stockholders				(21,000)	(21,000)	(22,000)
Balance	42,055,000	47,566,000	50,972,000	69,234,000	82,227,000	93,494,000	42,055,000	69,234,000
Balance	(40,407,000)						(40,407,000)
Additional Paid-In Capital [Member]
Balance	154,290,000	154,095,000	153,784,000	152,778,000	152,364,000	151,981,000	153,784,000	151,981,000
Share-based compensation expense	614,000	308,000	443,000	497,000	466,000	415,000
Restricted Stock Units		(113,000)	(132,000)		(52,000)	(32,000)
Balance	154,904,000	154,290,000	154,095,000	153,275,000	152,778,000	152,364,000	154,904,000	153,275,000
Retained Earnings (Accumulated Deficit) [Member]
Balance	(62,705,000)	(59,927,000)	(48,816,000)	(30,422,000)	(27,986,000)	(12,632,000)	(48,816,000)	(12,632,000)
Net income (loss)	(4,400,000)	(2,778,000)	(11,111,000)	(5,177,000)	(2,436,000)	(15,354,000)
Balance	$ (67,105,000)	(62,705,000)	(59,927,000)	(35,599,000)	(30,422,000)	(27,986,000)	(67,105,000)	(35,599,000)
Treasury Shares [Member]
Balance		$ (40,407)	(40,407)	(40,407)	(40,407)	(40,407)	$ (40,407)	(40,407)
Balance, shares	(40,407)
Balance, shares	(40,407)	(40,407)					(40,407)
Balance			(40,407)	(40,407)	(40,407)	(40,407)		(40,407)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	$ (3,990,000)	$ (3,250,000)	(1,957,000)	(812,000)	8,406,000	4,882,000	$ (1,957,000)	4,882,000
Other comprehensive income, net	(1,657,000)	(740,000)	(1,293,000)	(8,167,000)	(9,218,000)	3,524,000	(3,690,000)
Balance	(5,647,000)	(3,990,000)	(3,250,000)	(8,979,000)	(812,000)	8,406,000	(5,647,000)	(8,979,000)
Reading International Inc. Stockholders' Equity [Member]
Balance	47,441,000	50,763,000	62,856,000	81,388,000	92,628,000	104,074,000	62,856,000	104,074,000
Net income (loss)	(4,400,000)	(2,778,000)	(11,111,000)	(5,177,000)	(2,436,000)	(15,354,000)
Other comprehensive income, net	(1,657,000)	(740,000)	(1,293,000)	(8,167,000)	(9,218,000)	3,524,000
Share-based compensation expense	614,000	308,000	443,000	497,000	466,000	415,000
Restricted Stock Units		(112,000)	(132,000)		(52,000)	(31,000)
Balance	41,998,000	47,441,000	50,763,000	68,541,000	81,388,000	92,628,000	41,998,000	68,541,000
Noncontrolling Interests [Member]
Balance	125,000	209,000	423,000	839,000	866,000	986,000	423,000	986,000
Net income (loss)	(65,000)	(83,000)	(213,000)	(122,000)	(7,000)	(99,000)
Other comprehensive income, net	(3,000)	(1,000)	(1,000)	(3,000)	1,000	1,000
Distributions to noncontrolling stockholders				(21,000)	(21,000)	(22,000)
Balance	$ 57,000	125,000	$ 209,000	693,000	839,000	866,000	$ 57,000	693,000
Class A [Member]
Balance, shares			20,412,185				20,412,185
Balance, shares	20,592,834						20,592,834
Class A [Member] | Common Stock Shares Outstanding [Member]
Balance	$ 236,000	$ 235,000	$ 235,000	$ 234,000	$ 234,000	$ 233,000	$ 235,000	$ 233,000
Balance, shares	20,593	20,501	20,412	20,361	20,312	20,260	20,412	20,260
Restricted Stock Units		$ 1,000				$ 1,000
Restricted Stock Units, shares	0	92	89		49	52
Balance	$ 236,000	$ 236,000	$ 235,000	$ 234,000	$ 234,000	$ 234,000	$ 236,000	$ 234,000
Balance, shares	20,593	20,593	20,501	20,361	20,361	20,312	20,593	20,361
Class B [Member]
Balance, shares			1,680,590				1,680,590
Balance, shares	1,680,590						1,680,590
Class B [Member] | Common Stock Shares Outstanding [Member]
Balance	$ 17,000	$ 17,000	$ 17,000	$ 17,000	$ 17,000	$ 17,000	$ 17,000	$ 17,000
Balance, shares	1,681	1,681	1,681	1,680	1,680	1,680	1,681	1,680
Balance	$ 17,000	$ 17,000	$ 17,000	$ 17,000	$ 17,000	$ 17,000	$ 17,000	$ 17,000
Balance, shares	1,681	1,681	1,681	1,680	1,680	1,680	1,681	1,680