Noncontrolling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Balance	$ 139,616	$ 179,979
Net income	(5,955)	(2,141)
Other comprehensive income, net	(15,897)	1,511
Share-based compensation expense	336	280
Share repurchase plan	(671)	(9)
Class A common stock issued for share-based bonuses and options exercised		(185)
Restricted Stock Units	(30)	(74)
Contributions from noncontrolling stockholders		18
Distributions to noncontrolling stockholders		(27)
Balance	117,400	179,334
Additional Paid-In Capital [Member]
Balance	148,602	147,452
Share-based compensation expense	336	280
Class A common stock issued for share-based bonuses and options exercised		(185)
Restricted Stock Units	(30)	(75)
Balance	148,908	147,472
Retained Earnings (Accumulated Deficit) [Member]
Balance	20,647	47,048
Net income	(5,875)	(2,125)
Balance	$ 14,772	$ 44,951
Treasury Shares [Member]
Balance, shares	(39,737)	(25,222)
Share repurchase plan, shares	(670)	(9)
Balance, shares	(40,407)	(25,231)
Accumulated Other Comprehensive Income/(Loss) [Member]
Balance	$ 5,589	$ 6,115
Other comprehensive income, net	(15,879)	1,510
Balance	(10,290)	7,625
Reading International Inc. Stockholders' Equity [Member]
Balance	135,349	175,642
Net income	(5,875)	(2,125)
Other comprehensive income, net	(15,879)	1,510
Share-based compensation expense	336	280
Share repurchase plan	(671)	(9)
Class A common stock issued for share-based bonuses and options exercised		(185)
Restricted Stock Units	(30)	(74)
Balance	113,231	175,067
Noncontrolling Stockholders' Equity [Member]
Balance	4,267	4,337
Net income	(80)	(16)
Other comprehensive income, net	(18)	1
Contributions from noncontrolling stockholders		18
Distributions to noncontrolling stockholders		(27)
Balance	$ 4,169	4,267
Accounting Standards Update 2016-02 [Member]
Adjustments to opening retained earnings on adoption of ASC 842		(18)
Accounting Standards Update 2016-02 [Member] \| Retained Earnings (Accumulated Deficit) [Member]
Adjustments to opening retained earnings on adoption of ASC 842		28
Accounting Standards Update 2016-02 [Member] \| Reading International Inc. Stockholders' Equity [Member]
Adjustments to opening retained earnings on adoption of ASC 842		28
Accounting Standards Update 2016-02 [Member] \| Noncontrolling Stockholders' Equity [Member]
Adjustments to opening retained earnings on adoption of ASC 842		(46)
Class A [Member]
Balance, shares	20,102,535
Balance, shares	20,046,762
Class A [Member] \| Common Stock Shares Outstanding [Member]
Balance	$ 231	$ 232
Balance, shares	20,103	21,195
Share repurchase plan, shares	(75)
Restricted Stock Units		$ 1
Restricted Stock Units, shares	19	40
Balance	$ 231	$ 233
Balance, shares	20,047	21,235
Class B [Member]
Balance, shares	1,680,590
Balance, shares	1,680,590
Class B [Member] \| Common Stock Shares Outstanding [Member]
Balance	$ 17	$ 17
Balance, shares	1,680	1,680
Balance	$ 17	$ 17
Balance, shares	1,680	1,680

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