Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 74,261	$ 66,116	$ 234,395	$ 208,037
Operating income	4,539	3,667	18,849	17,012
Income before income taxes	2,741	2,229	14,111	31,927
Income tax expense	(1,482)	(750)	(4,618)	(8,316)
Net income	1,259	1,479	9,493	23,611
Net income attributable to Reading International, Inc. common shareholders	$ 1,297	$ 1,577	$ 9,405	$ 23,677
Basic earnings per share	$ 0.06	$ 0.07	$ 0.41	$ 1.02
Diluted earnings per share	$ 0.06	$ 0.07	$ 0.41	$ 1.01
Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 3,590	$ 4,057	$ 11,286	$ 11,975
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		66,087		207,954
Operating income		3,638		16,929
Income before income taxes		2,200		31,844
Income tax expense		(742)		(8,291)
Net income		1,458		23,553
Net income attributable to Reading International, Inc. common shareholders		$ 1,556		$ 23,619
Basic earnings per share		$ 0.07		$ 1.02
Diluted earnings per share		$ 0.07		$ 1.01
Previously Reported [Member] | Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ 4,028		$ 11,892
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		29		83
Operating income		29		83
Income before income taxes		29		83
Income tax expense		(8)		(25)
Net income		21		58
Net income attributable to Reading International, Inc. common shareholders		$ 21		$ 58
Basic earnings per share		$ 0.00		$ 0.00
Diluted earnings per share		$ 0.00		$ 0.00
Adjustments [Member] | Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue		$ 29		$ 83