Investment in NCMI/NCM - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended	9 Months Ended
	Mar. 20, 2023	Feb. 17, 2023	Sep. 30, 2023	Sep. 30, 2023		Sep. 30, 2022	Aug. 03, 2023
Schedule Of Equity Method Investments [Line Items]
Number of additional common units of NCM receive under common unit adjustment agreement				4,800,000
Estimated fair value of additional common units received				$ 0.0		$ 1.3
NCM
Schedule Of Equity Method Investments [Line Items]
Recognized incremental screen rental revenue and offsetting interest expense				17.0		$ 17.5
Amortization of screen advertising advances				$ 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 share units in Ncm in exchange	1,700,000	43,700,000
Number of Ncm to redeem shares		42,000,000
Company Recorded AnImpairment Charge				$ 0.7
Deferred revenue or NCM screen advertising advances extended term				2041-02
Investment In NCMI
Schedule Of Equity Method Investments [Line Items]
Number of common shares held in NCMI							4,400,000
New issued shares of NCMI	1,700,000	42,000,000
Unrealized gain			$ 4.7	$ 13.9	[1]
Interest in common units of NCM owned by Company			5.00%	5.00%

[1] See Investment in National CineMedia below.