Investments in Affiliates - Summary of Transactions with Each of the Company's Other Investees (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AC JV, LLC | Film rentals and advertising
Schedule Of Equity Method Investments [Line Items]
Event fees paid	[1]	$ 3.3	$ 2.1	$ 10.7	$ 6.6
Digital Cinema Distribution Coalition
Schedule Of Equity Method Investments [Line Items]
Content delivery fees paid	[1]	$ 0.1	$ 0.1	$ 0.4	$ 0.4

[1] Included in film rentals and advertising costs on the condensed consolidated statements of income (loss).