Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 76,096		$ 84,262		$ 137,646	$ 160,133
Operating income (loss)	5,817		8,614		4,515	14,306
Income (loss) before income taxes	4,011		7,094		872	11,367
Income tax benefit (expense)	(1,654)		(1,965)		(612)	(3,135)
Net income (loss)	2,357	$ (2,097)	5,129	$ 3,104	260	8,232
Net income (loss) attributable to Reading International, Inc. common stockholders	$ 2,394		$ 5,027		$ 313	$ 8,108
Basic earnings (loss) per share	$ 0.10		$ 0.22		$ 0.01	$ 0.35
Diluted earnings (loss) per share	$ 0.10		$ 0.22		$ 0.01	$ 0.35
Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 3,713		$ 4,079		$ 7,278	$ 7,695
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue			84,222			160,043
Operating income (loss)			8,574			14,216
Income (loss) before income taxes			7,054			11,277
Income tax benefit (expense)			(1,953)			(3,108)
Net income (loss)			5,101			8,169
Net income (loss) attributable to Reading International, Inc. common stockholders			$ 4,999			$ 8,045
Basic earnings (loss) per share			$ 0.22			$ 0.35
Diluted earnings (loss) per share			$ 0.22			$ 0.35
As Reported [Member] | Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue			$ 4,039			$ 7,605
Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue			40			90
Operating income (loss)			40			90
Income (loss) before income taxes			40			90
Income tax benefit (expense)			(12)			(27)
Net income (loss)			28			63
Net income (loss) attributable to Reading International, Inc. common stockholders			28			63
Adjustments [Member] | Real Estate [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue			$ 40			$ 90