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, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Noncontrolling Interest [Line Items]
Balance		$ (40,407)			$ (40,407)
Balance	$ 17,728	32,996	$ 50,972	$ 63,279	32,996	$ 63,279
Net income (loss)	(9,536)	(13,403)	(2,861)	(11,324)	(22,939)	(14,185)
Other comprehensive income, net	887	(2,541)	(741)	(1,294)
Share-based compensation expense	456	678	308	443
Restricted Stock Units	(4)	(2)	(112)	(132)
Balance	9,531	17,728	47,566	50,972	9,531	47,566
Balance	(40,407)				(40,407)
Additional Paid-In Capital [Member]
Noncontrolling Interest [Line Items]
Balance	156,078	155,402	154,095	153,784	155,402	153,784
Share-based compensation expense	456	678	308	443
Restricted Stock Units	(5)	(2)	(113)	(132)
Balance	156,529	156,078	154,290	154,095	156,529	154,290
Retained Earnings (Accumulated Deficit) [Member]
Noncontrolling Interest [Line Items]
Balance	(92,717)	(79,489)	(59,927)	(48,816)	(79,489)	(48,816)
Net income (loss)	(9,341)	(13,228)	(2,778)	(11,111)
Balance	(102,058)	(92,717)	(62,705)	(59,927)	(102,058)	(62,705)
Treasury Shares [Member]
Noncontrolling Interest [Line Items]
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]
Noncontrolling Interest [Line Items]
Balance	(5,211)	(2,673)	(3,250)	(1,957)	(2,673)	(1,957)
Other comprehensive income, net	886	(2,538)	(740)	(1,293)	(1,652)
Balance	(4,325)	(5,211)	(3,990)	(3,250)	(4,325)	(3,990)
Reading International Inc. Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance	17,997	33,087	50,763	62,856	33,087	62,856
Net income (loss)	(9,341)	(13,228)	(2,778)	(11,111)
Other comprehensive income, net	886	(2,538)	(740)	(1,293)
Share-based compensation expense	456	678	308	443
Restricted Stock Units	(4)	(2)	(112)	(132)
Balance	9,994	17,997	47,441	50,763	9,994	47,441
Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Balance	(269)	(91)	209	423	(91)	423
Net income (loss)	(195)	(175)	(83)	(213)
Other comprehensive income, net	1	(3)	(1)	(1)
Balance	$ (463)	$ (269)	125	209	$ (463)	125
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	$ 237	$ 237	$ 235	$ 235	$ 237	$ 235
Balance, shares	20,673,000	20,664,000	20,499,000	20,410,000	20,664,000	20,410,000
Restricted Stock Units	$ 1		$ 1
Restricted Stock Units, shares	72,000	9,000	92,000	89,000
Balance	$ 238	$ 237	$ 236	$ 235	$ 238	$ 236
Balance, shares	20,745,000	20,673,000	20,591,000	20,499,000	20,745,000	20,591,000
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
Balance, shares	1,681,000	1,681,000	1,680,000	1,680,000	1,681,000	1,680,000
Balance	$ 17	$ 17	$ 17	$ 17	$ 17	$ 17
Balance, shares	1,681,000	1,681,000	1,680,000	1,680,000	1,681,000	1,680,000