Non-controlling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Balance			$ (40,407)				$ (40,407)
Balance	$ 82,227	$ 93,494	105,060	$ 117,199	$ 95,749	$ 81,173	105,060	$ 81,173
Net income (loss)	(5,299)	(2,443)	(15,453)	(10,200)	22,594	22,067	(23,195)	34,461
Other comprehensive income, net	(8,170)	(9,217)	3,525	(4,029)	(1,592)	(2,545)
Share-based compensation expense	497	466	415	606	450	464
Restricted Stock Units		(52)	(31)	(3)	(2)	(110)
Distributions to noncontrolling stockholders	(21)	(21)	(22)			(5,300)
Balance	69,234	82,227	93,494	103,573	117,199	95,749	69,234	103,573
Balance	(40,407)						(40,407)
Additional Paid-In Capital [Member]
Balance	152,778	152,364	151,981	150,780	150,332	149,979	151,981	149,979
Share-based compensation expense	497	466	415	606	450	464
Restricted Stock Units		(52)	(32)	(3)	(2)	(111)
Balance	153,275	152,778	152,364	151,383	150,780	150,332	153,275	151,383
Retained Earnings (Accumulated Deficit) [Member]
Balance	(30,422)	(27,986)	(12,632)	(2,886)	(25,588)	(44,553)	(12,632)	(44,553)
Net income (loss)	(5,177)	(2,436)	(15,354)	(10,095)	22,702	18,965
Balance	(35,599)	(30,422)	(27,986)	(12,981)	(2,886)	(25,588)	(35,599)	(12,981)
Treasury Shares [Member]
Balance		(40,407)	(40,407)	(40,407)	(40,407)	(40,407)	(40,407)	(40,407)
Balance	(40,407)
Balance		(40,407)
Balance	(40,407)		(40,407)	(40,407)	(40,407)	(40,407)	(40,407)	(40,407)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	(812)	8,406	4,882	8,365	9,957	12,502	4,882	12,502
Other comprehensive income, net	(8,167)	(9,218)	3,524	(4,029)	(1,592)	(2,545)
Balance	(8,979)	(812)	8,406	4,336	8,365	9,957	(8,979)	4,336
Reading International Inc. Stockholders' Equity [Member]
Balance	81,388	92,628	104,074	116,101	94,543	77,769	104,074	77,769
Net income (loss)	(5,177)	(2,436)	(15,354)	(10,095)	22,702	18,965
Other comprehensive income, net	(8,167)	(9,218)	3,524	(4,029)	(1,592)	(2,545)
Share-based compensation expense	497	466	415	606	450	464
Restricted Stock Units		(52)	(31)	(3)	(2)	(110)
Balance	68,541	81,388	92,628	102,580	116,101	94,543	68,541	102,580
Noncontrolling Interests [Member]
Balance	839	866	986	1,098	1,206	3,404	986	3,404
Net income (loss)	(122)	(7)	(99)	(105)	(108)	3,102
Other comprehensive income, net	(3)	1	1
Distributions to noncontrolling stockholders	(21)	(21)	(22)			(5,300)
Balance	$ 693	839	$ 866	993	1,098	1,206	$ 693	993
Class A [Member]
Balance, shares			20,262,390				20,262,390
Balance, shares	20,363,234						20,363,234
Class A [Member] | Common Stock Shares Outstanding [Member]
Balance	$ 234	$ 234	$ 233	$ 232	$ 232	$ 231	$ 233	$ 231
Balance, shares	20,361	20,312	20,260	20,125	20,121	20,069	20,260	20,069
Restricted Stock Units			$ 1			$ 1
Restricted Stock Units, shares		49	52	2	4	52
Balance	$ (234)	$ 234	$ 234	$ 232	$ 232	$ 232	$ (234)	$ 232
Balance, shares	20,361	20,361	20,312	20,127	20,125	20,121	20,361	20,127
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	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17
Balance, shares	1,680	1,680	1,680	1,680	1,680	1,680	1,680	1,680
Balance	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17
Balance, shares	1,680	1,680	1,680	1,680	1,680	1,680	1,680	1,680