Non-controlling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance		$ (40,407)			$ (40,407)
Balance	$ 93,494	105,060	$ 95,749	$ 81,173	105,060	$ 81,173
Net income (loss)	(2,443)	(15,453)	22,594	22,067	(17,895)	44,661
Other comprehensive income, net	(9,217)	3,525	(1,592)	(2,545)
Share-based compensation expense	466	415	450	464
Restricted Stock Units	(52)	(31)	(2)	(110)
Distributions to noncontrolling stockholders	(21)	(22)		(5,300)
Balance	82,227	93,494	117,199	95,749	82,227	117,199
Balance	(40,407)				(40,407)
Additional Paid-In Capital [Member]
Balance	152,364	151,981	150,332	149,979	151,981	149,979
Share-based compensation expense	466	415	450	464
Restricted Stock Units	(52)	(32)	(2)	(111)
Balance	152,778	152,364	150,780	150,332	152,778	150,780
Retained Earnings (Accumulated Deficit) [Member]
Balance	(27,986)	(12,632)	(25,588)	(44,553)	(12,632)	(44,553)
Net income (loss)	(2,436)	(15,354)	22,702	18,965
Balance	(30,422)	(27,986)	(2,886)	(25,588)	(30,422)	(2,886)
Treasury Shares [Member]
Balance	(40,407)	(40,407)	(40,407)	(40,407)	(40,407)	(40,407)
Balance	(40,407)	(40,407)	(40,407)	(40,407)	(40,407)	(40,407)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	8,406	4,882	9,957	12,502	4,882	12,502
Other comprehensive income, net	(9,218)	3,524	(1,592)	(2,545)
Balance	(812)	8,406	8,365	9,957	(812)	8,365
Reading International Inc. Stockholders' Equity [Member]
Balance	92,628	104,074	94,543	77,769	104,074	77,769
Net income (loss)	(2,436)	(15,354)	22,702	18,965
Other comprehensive income, net	(9,218)	3,524	(1,592)	(2,545)
Share-based compensation expense	466	415	450	464
Restricted Stock Units	(52)	(31)	(2)	(110)
Balance	81,388	92,628	116,101	94,543	81,388	116,101
Noncontrolling Interests [Member]
Balance	866	986	1,206	3,404	986	3,404
Net income (loss)	(7)	(99)	(108)	3,102
Other comprehensive income, net	1	1
Distributions to noncontrolling stockholders	(21)	(22)		(5,300)
Balance	$ 839	$ 866	1,098	1,206	$ 839	1,098
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	$ 233	$ 232	$ 231	$ 233	$ 231
Balance, shares	20,312	20,260	20,121	20,069	20,260	20,069
Restricted Stock Units		$ 1		$ 1
Restricted Stock Units, shares	49	52	4	52
Balance	$ 234	$ 234	$ 232	$ 232	$ 234	$ 232
Balance, shares	20,361	20,312	20,125	20,121	20,361	20,125
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
Balance, shares	1,680	1,680	1,680	1,680	1,680	1,680
Balance	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17
Balance, shares	1,680	1,680	1,680	1,680	1,680	1,680