Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 61,551	$ 75,872
Operating income (loss)	(1,301)	5,693
Income before income taxes	(3,139)	4,274
Income tax benefit (expense)	1,042	(1,170)
Net income (loss)	(2,097)	3,104
Net income (loss) attributable to Reading International, Inc. common stockholders	$ (2,081)	$ 3,082
Basic earnings (loss) per share	$ (0.09)	$ 0.13
Diluted earnings (loss) per share	$ (0.09)	$ 0.13
Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 3,565	$ 3,617
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		75,822
Operating income (loss)		5,643
Income before income taxes		4,224
Income tax benefit (expense)		(1,155)
Net income (loss)		3,069
Net income (loss) attributable to Reading International, Inc. common stockholders		$ 3,047
Basic earnings (loss) per share		$ 0.13
Diluted earnings (loss) per share		$ 0.13
As Reported [Member] | Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ 3,567
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		50
Operating income (loss)		50
Income before income taxes		50
Income tax benefit (expense)		(15)
Net income (loss)		35
Net income (loss) attributable to Reading International, Inc. common stockholders		35
Adjustments [Member] | Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ 50