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Summary of Impairment Charges (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |
Total Impairment |  | $ 2,000,000 | $ 15,200,000 | $ 12,100,000 | $ 107,500,000
U.S. Operating Segment |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |
Theatre properties |  | 1 | 1.1 | 4.9 | 3.6
Theatre operating lease right-of-use assets |  | 1 | 2.7 | 4.4 | 4.7
Total Impairment |  | 2 | 15 | 10 | 106.3
U.S. Operating Segment | Investment in NCMI/NCM |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |
Investment in NCMI/NCM | [1] | 0 | 11.2 | 0.7 | 98
International Operating Segment |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |
Theatre properties |  | 0 | 0.1 | 0.6 | 0.8
Theatre operating lease right-of-use assets |  | 0 | 0.1 | 1.5 | 0.4
Total Impairment |  | $ 0 | $ 0.2 | $ 2.1 | $ 1.2
[1] | See discussion at Impairment of NCMI Investment in Note 8.

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-8A + Details
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