Summary of Activity with NCM Included in Company's Consolidated Financial Statements (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Schedule Of Equity Method Investments [Line Items]
Equity in loss		$ (2.2)	$ (6.8)
Investment In NCM
Schedule Of Equity Method Investments [Line Items]
Beginning Balance		135.4
Equity in loss		(3.5)
Ending Balance		131.9
N C M Screen Advertising Advances
Schedule Of Equity Method Investments [Line Items]
Beginning Balance		(346.0)
Interest accrued on NCM screen advertising advances	[1]	(5.8)
Amortization of screen advertising advances		8.0
Ending Balance		(343.8)
Equity in Loss
Schedule Of Equity Method Investments [Line Items]
Equity in loss		3.5
Ending Balance		3.5
Other Revenues
Schedule Of Equity Method Investments [Line Items]
Screen rental revenues earned under ESA	[2]	(4.2)
Amortization of screen advertising advances		(8.0)
Ending Balance		(12.2)
Interest Expense - NCM
Schedule Of Equity Method Investments [Line Items]
Interest accrued on NCM screen advertising advances		5.8
Ending Balance		5.8
Cash Received
Schedule Of Equity Method Investments [Line Items]
Screen rental revenues earned under ESA	[2]	4.2
Ending Balance		$ 4.2

[1] See Note 9 for the maturity of NCM screen advertising advances as of March 31, 2022.

[2] Amounts include the per patron and per digital screen theatre access fees due to the Company, net of amounts due to NCM for on-screen advertising time provided to the Company’s beverage concessionaire of approximately $1.5. (2) The Company had a receivable from NCM of $6.2 as of March 31, 2022.