Non-controlling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Balance	$ (40,407,000)
Balance	105,060,000	$ 81,173,000
Net income (loss)	(15,453,000)	22,068,000
Other comprehensive income, net	3,525,000	(2,545,000)
Share-based compensation expense	415,000	464,000
Restricted Stock Units	(31,000)	(110,000)
Distributions to noncontrolling stockholders	(22,000)	(5,300,000)
Balance	93,494,000	95,750,000
Balance	(40,407,000)
Additional Paid-In Capital [Member]
Balance	151,981,000	149,979,000
Share-based compensation expense	415,000	464,000
Restricted Stock Units	(32,000)	(111,000)
Balance	152,364,000	150,332,000
Retained Earnings (Accumulated Deficit) [Member]
Balance	(12,632,000)	(44,553,000)
Net income (loss)	(15,354,000)	18,965,000
Balance	(27,986,000)	(25,588,000)
Treasury Shares [Member]
Balance	(40,407,000)	(40,407)
Balance	(40,407,000)	(40,407)
Accumulated Other Comprehensive Income (Loss) [Member]
Balance	4,882,000	12,502,000
Other comprehensive income, net	3,524,000	(2,545,000)
Balance	8,406,000	9,957,000
Reading International Inc. Stockholders' Equity [Member]
Balance	104,074,000	77,769,000
Net income (loss)	(15,354,000)	18,965,000
Other comprehensive income, net	3,524,000	(2,545,000)
Share-based compensation expense	415,000	464,000
Restricted Stock Units	(31,000)	(110,000)
Balance	92,628,000	94,543,000
Noncontrolling Interests [Member]
Balance	986,000	3,404,000
Net income (loss)	(99,000)	3,103,000
Other comprehensive income, net	1,000
Distributions to noncontrolling stockholders	(22,000)	(5,300,000)
Balance	$ 866,000	1,207,000
Class A [Member]
Balance, shares	20,262,390
Balance, shares	20,314,372
Class A [Member] | Common Stock Shares Outstanding [Member]
Balance	$ 233,000	$ 231,000
Balance, shares	20,260	20,069
Restricted Stock Units	$ 1,000	$ 1,000
Restricted Stock Units, shares	52	52
Balance	$ 234,000	$ 232,000
Balance, shares	20,312	20,121
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