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Non-controlling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance |  |  | $ (40,407) |  |  |  | $ (40,407) |
Balance | $ 9,531 | $ 17,728 | 32,996 | $ 47,566 | $ 50,972 | $ 63,279 | 32,996 | $ 63,279
Net income (loss) | (7,027) | (9,536) | (13,403) | (4,465) | (2,861) | (11,324) | (29,966) | (18,650)
Other comprehensive income, net | 1,499 | 887 | (2,541) | (1,660) | (741) | (1,294) |  |
Share-based compensation expense | 603 | 456 | 678 | 614 | 308 | 443 |  |
Restricted Stock Units |  | (4) | (2) |  | (112) | (132) |  |
Balance | 4,606 | 9,531 | 17,728 | 42,055 | 47,566 | 50,972 | 4,606 | 42,055
Balance | (40,407) |  |  |  |  |  | (40,407) |
Additional Paid-In Capital [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance | 156,529 | 156,078 | 155,402 | 154,290 | 154,095 | 153,784 | 155,402 | 153,784
Share-based compensation expense | 603 | 456 | 678 | 614 | 308 | 443 |  |
Restricted Stock Units |  | (5) | (2) |  | (113) | (132) |  |
Balance | 157,132 | 156,529 | 156,078 | 154,904 | 154,290 | 154,095 | 157,132 | 154,904
Retained Earnings (Accumulated Deficit) [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance | (102,058) | (92,717) | (79,489) | (62,705) | (59,927) | (48,816) | (79,489) | (48,816)
Net income (loss) | (6,916) | (9,341) | (13,228) | (4,400) | (2,778) | (11,111) |  |
Balance | (108,974) | (102,058) | (92,717) | (67,105) | (62,705) | (59,927) | (108,974) | (67,105)
Treasury Shares [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance | (40,407) | (40,407) | (40,407) | (40,407) | (40,407) | (40,407) | (40,407) | (40,407)
Balance | (40,407) | (40,407) | (40,407) | (40,407) | (40,407) | (40,407) | (40,407) | (40,407)
Accumulated Other Comprehensive Income/(Loss) [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance | (4,325) | (5,211) | (2,673) | (3,990) | (3,250) | (1,957) | (2,673) | (1,957)
Other comprehensive income, net | 1,494 | 886 | (2,538) | (1,657) | (740) | (1,293) | (158) |
Balance | (2,831) | (4,325) | (5,211) | (5,647) | (3,990) | (3,250) | (2,831) | (5,647)
Reading International Inc. Stockholders' Equity [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance | 9,994 | 17,997 | 33,087 | 47,441 | 50,763 | 62,856 | 33,087 | 62,856
Net income (loss) | (6,916) | (9,341) | (13,228) | (4,400) | (2,778) | (11,111) |  |
Other comprehensive income, net | 1,494 | 886 | (2,538) | (1,657) | (740) | (1,293) |  |
Share-based compensation expense | 603 | 456 | 678 | 614 | 308 | 443 |  |
Restricted Stock Units |  | (4) | (2) |  | (112) | (132) |  |
Balance | 5,175 | 9,994 | 17,997 | 41,998 | 47,441 | 50,763 | 5,175 | 41,998
Noncontrolling Interests [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance | (463) | (269) | (91) | 125 | 209 | 423 | (91) | 423
Net income (loss) | (111) | (195) | (175) | (65) | (83) | (213) |  |
Other comprehensive income, net | 5 | 1 | (3) | (3) | (1) | (1) |  |
Balance | $ (569) | (463) | $ (269) | 57 | 125 | 209 | $ (569) | 57
Class A [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance, shares |  |  | 20,666,516 |  |  |  | 20,666,516 |
Balance, shares | 20,745,594 |  |  |  |  |  | 20,745,594 |
Class A [Member] | Common Stock Shares Outstanding [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance | $ 238 | $ 237 | $ 237 | $ 236 | $ 235 | $ 235 | $ 237 | $ 235
Balance, shares | 20,743,000 | 20,673,000 | 20,664,000 | 20,593,000 | 20,501,000 | 20,412,000 | 20,664,000 | 20,412,000
Restricted Stock Units |  | $ 1 |  |  | $ 1 |  |  |
Restricted Stock Units, shares |  | 70,000 | 9,000 | 0 | 92,000 | 89,000 |  |
Balance | $ 238 | $ 238 | $ 237 | $ 236 | $ 236 | $ 235 | $ 238 | $ 236
Balance, shares | 20,743,000 | 20,743,000 | 20,673,000 | 20,593,000 | 20,593,000 | 20,501,000 | 20,743,000 | 20,593,000
Class B [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance, shares |  |  | 1,680,590 |  |  |  | 1,680,590 |
Balance, shares | 1,680,590 |  |  |  |  |  | 1,680,590 |
Class B [Member] | Common Stock Shares Outstanding [Member] |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |
Balance | $ 17 | $ 17 | $ 17 | $ 17 | $ 17 | $ 17 | $ 17 | $ 17
Balance, shares | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000
Balance | $ 17 | $ 17 | $ 17 | $ 17 | $ 17 | $ 17 | $ 17 | $ 17
Balance, shares | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000 | 1,681,000

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