Non-controlling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Balance	$ (40,407,000)
Balance	81,173,000	$ 139,616,000
Net income (loss)	22,068,000	(5,955,000)
Other comprehensive income, net	(2,545,000)	(15,897,000)
Share-based compensation expense	464,000	336,000
Share repurchase plan		(671,000)
Restricted Stock Units	(110,000)	(30,000)
Distributions to noncontrolling stockholders	(5,300,000)
Balance	95,750,000	117,400,000
Balance	(40,407,000)
Additional Paid-In Capital [Member]
Balance	149,979,000	148,602,000
Share-based compensation expense	464,000	336,000
Restricted Stock Units	(111,000)	(30,000)
Balance	150,332,000	148,908,000
Retained Earnings (Accumulated Deficit) [Member]
Balance	(44,553,000)	20,647,000
Net income (loss)	18,965,000	(5,875,000)
Balance	(25,588,000)	14,772,000
Treasury Shares [Member]
Balance	(40,407,000)	$ (39,737)
Share repurchase plan, shares		(670)
Balance	(40,407,000)	$ (40,407)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	12,502,000	5,589,000
Other comprehensive income, net	(2,545,000)	(15,879,000)
Balance	9,957,000	(10,290,000)
Reading International Inc. Stockholders' Equity [Member]
Balance	77,769,000	135,349,000
Net income (loss)	18,965,000	(5,875,000)
Other comprehensive income, net	(2,545,000)	(15,879,000)
Share-based compensation expense	464,000	336,000
Share repurchase plan		(671,000)
Restricted Stock Units	(110,000)	(30,000)
Balance	94,543,000	113,231,000
Noncontrolling Interests [Member]
Balance	3,404,000	4,267,000
Net income (loss)	3,103,000	(80,000)
Other comprehensive income, net		(18,000)
Distributions to noncontrolling stockholders	(5,300,000)
Balance	$ 1,207,000	4,169,000
Class A [Member]
Balance, shares	20,068,607
Balance, shares	20,120,625
Class A [Member] | Common Stock Shares Outstanding [Member]
Balance	$ 231,000	$ 231,000
Balance, shares	20,069	20,103
Share repurchase plan, shares		(75)
Restricted Stock Units	$ 1,000
Restricted Stock Units, shares	52	19
Balance	$ 232,000	$ 231,000
Balance, shares	20,121	20,047
Class B [Member]
Balance, shares	1,680,590
Balance, shares	1,680,590
Class B [Member] | Common Stock Shares Outstanding [Member]
Balance	$ 17,000	$ 17,000
Balance, shares	1,680	1,680
Balance	$ 17,000	$ 17,000
Balance, shares	1,680	1,680