Noncontrolling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Noncontrolling Interest [Line Items]
Balance	$ 180,547	$ 177,287
Net income (loss)	(2,097)	3,104
Distributions to noncontrolling stockholders	(27)	(43)
Accumulated other comprehensive income (loss)	(1)	3
Balance	179,946	179,835
Reading International Inc. Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance	176,210	177,287
Net income (loss)	(2,081)	3,082
Increase in additional paid in capital	21	339
Treasury stock purchased	(9)	(317)
Contributions from noncontrolling stockholders
Distributions to noncontrolling stockholders
Accumulated other comprehensive income (loss)	1,510	(750)
Balance	175,679	179,835
Noncontrolling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance	4,337	4,331
Net income (loss)	(16)	22
Increase in additional paid in capital
Treasury stock purchased
Contributions from noncontrolling stockholders	18	27
Distributions to noncontrolling stockholders	(27)	(43)
Accumulated other comprehensive income (loss)	1	(3)
Balance	4,267	4,332
Total Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Balance	180,547	181,618
Net income (loss)	(2,097)	3,104
Increase in additional paid in capital	21	339
Treasury stock purchased	(9)	(317)
Contributions from noncontrolling stockholders	18	27
Distributions to noncontrolling stockholders	(27)	(43)
Accumulated other comprehensive income (loss)	1,511	(753)
Balance	$ 179,946	$ 184,167
Accounting Standards Update 2014-09 [Member] | Reading International Inc. Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Adjustments to opening retained earnings on adoption of ASC				$ 194
Accounting Standards Update 2014-09 [Member] | Noncontrolling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Adjustments to opening retained earnings on adoption of ASC				(2)
Accounting Standards Update 2014-09 [Member] | Total Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Adjustments to opening retained earnings on adoption of ASC				$ 192
Accounting Standards Update 2016-02 [Member] | Reading International Inc. Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Adjustments to opening retained earnings on adoption of ASC			$ 28
Accounting Standards Update 2016-02 [Member] | Noncontrolling Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Adjustments to opening retained earnings on adoption of ASC			(46)
Accounting Standards Update 2016-02 [Member] | Total Stockholders' Equity [Member]
Noncontrolling Interest [Line Items]
Adjustments to opening retained earnings on adoption of ASC			$ (18)