Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Income) (Details) - USD ($)	3 Months Ended											12 Months Ended
	Dec. 31, 2018	[1]	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	[1]	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 74,990,000		$ 74,261,000	$ 84,262,000	$ 75,872,000	$ 71,841,000		$ 66,116,000	$ 72,440,000	$ 69,481,000		$ 309,385,000	$ 279,879,000	$ 270,866,000	[2]
Operating income												24,078,000	20,706,000	20,704,000	[2]
Income before income taxes												17,918,000	34,492,000	13,830,000	[2]
Income tax expense												(3,420,000)	(3,380,000)	(4,138,000)	[2]
Net income	6,006,000		1,259,000	4,129,000	3,104,000	7,503,000		1,478,000	19,071,000	3,060,000		14,498,000	31,112,000	9,692,000	[2]
Net income attributable to Reading International, Inc. common shareholders	$ 4,960,000		$ 1,297,000	$ 5,027,000	$ 3,082,000	$ 7,426,000		$ 1,576,000	$ 19,051,000	$ 3,048,000		$ 14,366,000	$ 31,101,000	$ 9,678,000	[2]
Basic earnings per share	$ 0.21		$ 0.06	$ 0.22	$ 0.13	$ 0.33		$ 0.07	$ 0.82	$ 0.13		$ 0.62	$ 1.35	$ 0.42	[2]
Diluted earnings per share	$ 0.21		$ 0.06	$ 0.22	$ 0.13	$ 0.32		$ 0.07	$ 0.81	$ 0.13		$ 0.62	$ 1.34	$ 0.41	[2]
Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue												$ 15,208,000	$ 16,415,000	$ 13,944,000	[2]
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue													279,734,000	270,473,000
Operating income													20,561,000	20,311,000
Income before income taxes													34,347,000	13,437,000
Income tax expense													(3,337,000)	(4,020,000)
Net income													31,010,000	9,417,000
Net income attributable to Reading International, Inc. common shareholders													$ 30,999,000	$ 9,403,000
Basic earnings per share													$ 1.35	$ 0.40
Diluted earnings per share													$ 1.33	$ 0.40
As Reported [Member] | Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue													$ 16,270,000	$ 13,551,000
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue													145,000	393,000
Operating income													145,000	393,000
Income before income taxes													145,000	393,000
Income tax expense											$ 611,000		(43,000)	(118,000)
Net income													102,000	275,000
Net income attributable to Reading International, Inc. common shareholders													$ 102,000	$ 275,000
Basic earnings per share														$ 0.02
Diluted earnings per share													$ 0.01	$ 0.01
Adjustments [Member] | Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue													$ 145,000	$ 393,000

[1] Net income for the 4th quarter of 2017 includes approximately $2.5 million net tax benefit from non-recurring items of tax benefit and expense related to the Tax Cuts and Jobs Act enacted December 2017 and dissolution of a non-operating foreign subsidiary.

[2] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).