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Investment in National CineMedia Inc. - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 15, 2024 | Apr. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of additional common units of NCM receive under common unit adjustment agreement |  | 100,000 |  |  |  |  |
Estimated fair value of additional common units received |  | $ 0.5 |  |  | $ 0.5 |  | $ 0.0
NCM |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Recognized incremental screen rental revenue and offsetting interest expense |  |  |  |  | 16.5 |  | 17.0
Amortization of screen advertising advances |  |  |  |  | $ 24.3 |  | 24.3
NCM | Minimum |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of incremental borrowing rates |  |  |  |  | 4.40% |  |
NCM | Maximum |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Percentage of incremental borrowing rates |  |  |  |  | 8.30% |  |
Investment In NCM |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Common unit redemption | $ 4.95 |  |  |  |  |  |
Deferred revenue or NCM screen advertising advances extended term |  |  |  |  | 2041-02 |  |
Investment In NCMI |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Common unit redemption price | $ 0.6 |  |  |  |  |  |
Reduction in investment in NCM |  |  |  |  | $ 0.5 |  |
Net gain on investment in NCMI |  |  |  |  | $ 0.1 |  |
Number of common units of NCM owned by Company |  |  | 4,400,000 |  | 4,400,000 |  |
Unrealized gain |  |  | $ 11.6 | $ 4.7 | $ 12.7 | [1] | $ 13.9
Interest in common units of NCM owned by Company |  |  | 4.50% |  | 4.50% |  |
Amortization of screen advertising advances |  |  |  |  | $ 0.0 |  |
[1] | See Investment in National CineMedia below.

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