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, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Noncontrolling Interest [Line Items]
Balance			$ (40,407)				$ (40,407)
Balance	$ 9,531	$ 17,728	32,996	$ 47,566	$ 50,972	$ 63,279	32,996	$ 63,279
Net income (loss)	(7,027)	(9,536)	(13,403)	(4,465)	(2,861)	(11,324)	(29,966)	(18,650)
Other comprehensive income, net	1,499	887	(2,541)	(1,660)	(741)	(1,294)
Share-based compensation expense	603	456	678	614	308	443
Restricted Stock Units		(4)	(2)		(112)	(132)
Balance	4,606	9,531	17,728	42,055	47,566	50,972	4,606	42,055
Balance	(40,407)						(40,407)
Additional Paid-In Capital [Member]
Noncontrolling Interest [Line Items]
Balance	156,529	156,078	155,402	154,290	154,095	153,784	155,402	153,784
Share-based compensation expense	603	456	678	614	308	443
Restricted Stock Units		(5)	(2)		(113)	(132)
Balance	157,132	156,529	156,078	154,904	154,290	154,095	157,132	154,904
Retained Earnings (Accumulated Deficit) [Member]
Noncontrolling Interest [Line Items]
Balance	(102,058)	(92,717)	(79,489)	(62,705)	(59,927)	(48,816)	(79,489)	(48,816)
Net income (loss)	(6,916)	(9,341)	(13,228)	(4,400)	(2,778)	(11,111)
Balance	(108,974)	(102,058)	(92,717)	(67,105)	(62,705)	(59,927)	(108,974)	(67,105)
Treasury Shares [Member]
Noncontrolling Interest [Line Items]
Balance	(40,407)	(40,407)	(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)	(40,407)	(40,407)
Accumulated Other Comprehensive Income/(Loss) [Member]
Noncontrolling Interest [Line Items]
Balance	(4,325)	(5,211)	(2,673)	(3,990)	(3,250)	(1,957)	(2,673)	(1,957)
Other comprehensive income, net	1,494	886	(2,538)	(1,657)	(740)	(1,293)	(158)
Balance	(2,831)	(4,325)	(5,211)	(5,647)	(3,990)	(3,250)	(2,831)	(5,647)
Reading International Inc. Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance	9,994	17,997	33,087	47,441	50,763	62,856	33,087	62,856
Net income (loss)	(6,916)	(9,341)	(13,228)	(4,400)	(2,778)	(11,111)
Other comprehensive income, net	1,494	886	(2,538)	(1,657)	(740)	(1,293)
Share-based compensation expense	603	456	678	614	308	443
Restricted Stock Units		(4)	(2)		(112)	(132)
Balance	5,175	9,994	17,997	41,998	47,441	50,763	5,175	41,998
Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Balance	(463)	(269)	(91)	125	209	423	(91)	423
Net income (loss)	(111)	(195)	(175)	(65)	(83)	(213)
Other comprehensive income, net	5	1	(3)	(3)	(1)	(1)
Balance	$ (569)	(463)	$ (269)	57	125	209	$ (569)	57
Class A [Member]
Noncontrolling Interest [Line Items]
Balance, shares			20,666,516				20,666,516
Balance, shares	20,745,594						20,745,594
Class A [Member] | Common Stock Shares Outstanding [Member]
Noncontrolling Interest [Line Items]
Balance	$ 238	$ 237	$ 237	$ 236	$ 235	$ 235	$ 237	$ 235
Balance, shares	20,743,000	20,673,000	20,664,000	20,593,000	20,501,000	20,412,000	20,664,000	20,412,000
Restricted Stock Units		$ 1			$ 1
Restricted Stock Units, shares		70,000	9,000	0	92,000	89,000
Balance	$ 238	$ 238	$ 237	$ 236	$ 236	$ 235	$ 238	$ 236
Balance, shares	20,743,000	20,743,000	20,673,000	20,593,000	20,593,000	20,501,000	20,743,000	20,593,000
Class B [Member]
Noncontrolling Interest [Line Items]
Balance, shares			1,680,590				1,680,590
Balance, shares	1,680,590						1,680,590
Class B [Member] | Common Stock Shares Outstanding [Member]
Noncontrolling Interest [Line Items]
Balance	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17
Balance, shares	1,681,000	1,681,000	1,681,000	1,681,000	1,681,000	1,681,000	1,681,000	1,681,000
Balance	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17
Balance, shares	1,681,000	1,681,000	1,681,000	1,681,000	1,681,000	1,681,000	1,681,000	1,681,000