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, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Noncontrolling Interest [Line Items]
Balance	$ (8,428)	$ (8,684)	$ (4,790)	$ 6,066	$ 17,728	$ 32,996	$ (4,790)	$ 32,996
Net income (loss)	(4,305)	(2,804)	(4,947)	(7,139)	(13,001)	(13,403)	(12,057)	(33,543)
Other comprehensive income, net	(613)	2,712	453	1,499	887	(2,541)
Share-based compensation expense	391	530	600	603	456	678
Restricted Stock Units		(182)			(4)	(2)
Distributions to noncontrolling stockholders	(57)
Balance	(13,012)	(8,428)	(8,684)	1,029	6,066	17,728	(13,012)	1,029
Additional Paid-In Capital [Member]
Noncontrolling Interest [Line Items]
Balance	158,696	158,351	157,751	156,529	156,078	155,402	157,751	155,402
Share-based compensation expense	391	530	600	603	456	678
Restricted Stock Units		(185)			(5)	(2)
Distributions to noncontrolling stockholders	0
Balance	159,087	158,696	158,351	157,132	156,529	156,078	159,087	157,132
Retained Earnings (Accumulated Deficit) [Member]
Noncontrolling Interest [Line Items]
Balance	(122,213)	(119,546)	(114,790)	(105,523)	(92,717)	(79,489)	(114,790)	(79,489)
Net income (loss)	(4,157)	(2,667)	(4,756)	(7,028)	(12,806)	(13,228)
Balance	(126,370)	(122,213)	(119,546)	(112,551)	(105,523)	(92,717)	(126,370)	(112,551)
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	(4,017)	(6,721)	(7,173)	(4,325)	(5,211)	(2,673)	(7,173)	(2,673)
Other comprehensive income, net	(613)	2,704	452	1,494	886	(2,538)	2,543
Balance	(4,630)	(4,017)	(6,721)	(2,831)	(4,325)	(5,211)	(4,630)	(2,831)
Reading International Inc. Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance	(7,683)	(8,068)	(4,364)	6,529	17,997	33,087	(4,364)	33,087
Net income (loss)	(4,157)	(2,667)	(4,756)	(7,028)	(12,806)	(13,228)
Other comprehensive income, net	(613)	2,704	452	1,494	886	(2,538)
Share-based compensation expense	391	530	600	603	456	678
Restricted Stock Units		(182)			(4)	(2)
Balance	(12,062)	(7,683)	(8,068)	1,598	6,529	17,997	(12,062)	1,598
Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Balance	(745)	(616)	(426)	(463)	(269)	(91)	(426)	(91)
Net income (loss)	(148)	(137)	(191)	(111)	(195)	(175)
Other comprehensive income, net		8	1	5	1	(3)
Distributions to noncontrolling stockholders	(57)
Balance	$ (950)	(745)	$ (616)	(569)	(463)	(269)	$ (950)	(569)
Class A [Member]
Noncontrolling Interest [Line Items]
Balance, shares			20,745,594				20,745,594
Balance, shares	21,036,670						21,036,670
Class A [Member] | Common Stock Shares Outstanding [Member]
Noncontrolling Interest [Line Items]
Balance	$ 241	$ 238	$ 238	$ 238	$ 237	$ 237	$ 238	$ 237
Balance, shares	21,034,000	20,743,000	20,743,000	20,743,000	20,673,000	20,664,000	20,743,000	20,664,000
Restricted Stock Units		$ 3			$ 1
Restricted Stock Units, shares		291,000			70,000	9,000
Balance	$ 241	$ 241	$ 238	$ 238	$ 238	$ 237	$ 241	$ 238
Balance, shares	21,034,000	21,034,000	20,743,000	20,743,000	20,743,000	20,673,000	21,034,000	20,743,000
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