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Related Party Transactions - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($) Theatre	Sep. 30, 2024 USD ($)
Related Party Transaction [Line Items]
Debt instrument convertible conversation description		notice to the holders of the 4.50% Convertible Senior Notes of its election to settle all conversion obligations with respect to any 4.50% Convertible Senior Notes that are converted on or after May 15, 2025 by means of Combination Settlement as defined in the indenture to the 4.50% Convertible Senior Notes. On the August 15, 2025 maturity date of the 4.50% Convertible Senior Notes, the Company settled the $460.0 outstanding principal amount of the 4.50% Convertible Senior Notes in cash and issued approximately 16.2 shares of Holdings' common stock for the $472.0 owed above the $460.0 principal amount.
4.50 % Convertible Senior Notes
Related Party Transaction [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.50%	4.50%
CUSA
Related Party Transaction [Line Items]
Distributions from equity investees		$ 8,000,000	$ 5,100,000
Distributions to parent	$ (509,100,000)	(509,100,000)	0
FE Concepts, LLC
Related Party Transaction [Line Items]
Management fee revenues		$ 60,000.00	50,000.00
Percentage of voting interest	50.00%	50.00%
Entity owns remaining interest		50.00%
Cash distributions from affiliate/equity investment		$ 4,000,000
Laredo Theatre, Ltd
Related Party Transaction [Line Items]
Company's interest in Laredo		75.00%
Lone Star Theatre's interest in Laredo		25.00%
Ownership interest held by David Roberts		100.00%
Percentage of stock owned by founder		8.50%
Percentage of management fees based on theatre revenues		5.00%
Management fee revenues		$ 600,000	600,000
Excess cash distribution paid		$ 800,000	600,000
Syufy Enterprises, LP
Related Party Transaction [Line Items]
Number of theatres leased | Theatre		12
Management fee revenues		$ 30,000.00	30,000.00
Total rent paid to Syufy		16,500,000	$ 16,900,000
Film Reagan
Related Party Transaction [Line Items]
Film rental expense	$ 0	$ 1.8

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