Investment in NCMI/NCM - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended	6 Months Ended
	Mar. 20, 2023	Feb. 17, 2023	Jun. 30, 2023	Jun. 30, 2023		Jun. 30, 2022
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
Company Recorded AnImpairment Charge				0.7
NCM
Schedule Of Equity Method Investments [Line Items]
Recognized incremental screen rental revenue and offsetting interest expense				11.4		11.7
Amortization of screen advertising advances				$ 16.2		$ 16.2
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		42,000,000.0
Deferred revenue or NCM screen advertising advances extended term				2041-02
Investment In NCMI
Schedule Of Equity Method Investments [Line Items]
New issued shares of NCMI	1,700,000	42,000,000.0
Unrealized gain			$ 9.2	$ 9.2	[1]

[1] See Investment in National CineMedia below.