(Loss) Earnings Per Share - Computations of Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share Disclosure [Line Items]
Net (loss) income attributable to Cinemark Holdings, Inc.		$ (38.9)	$ 24.8
Loss (income) allocated to participating share-based awards	[1]	0.4	(0.4)
Basic net (loss) income attributable to common stockholders		(38.5)	24.4
Add: Interest expense on convertible notes, net of tax	[2]	0.0	4.8
Diluted net (loss) income attributable to common stockholders		$ (38.5)	$ 29.2
Basic weighted average shares outstanding		119,400	119,500
Common equivalent shares for performance and restricted stock units	[3]	0	900
Common equivalent shares for convertible notes	[2]	0	32,000
Common equivalent shares for warrants	[4]	0	0
Diluted weighted average shares outstanding		119,400	152,400
Basic (loss) earnings per share attributable to common stockholders		$ (0.32)	$ 0.2
Diluted (loss) earnings per share attributable to common stockholders		$ (0.32)	$ 0.19
Restricted Stock Units (RSUs)
Earnings Per Share Disclosure [Line Items]
Common equivalent shares for performance and restricted stock units		2,100

[1] For the three months ended March 31, 2025 and 2024, a weighted average of approximately 1.30 shares and 2.00 shares of restricted stock, respectively, were considered participating securities.

[2] For the three months ended March 31, 2025, diluted loss per share excludes the conversion of the 4.50% Convertible Senior Notes into 32.0 shares of common stock as they would be anti-dilutive. See further discussion below.

[3] For the three months ended March 31, 2025, approximately 2.10 common equivalent shares for performance and restricted stock units were excluded because they were anti-dilutive.

[4] For the three months ended March 31, 2025 and 2024, diluted (loss) earnings per share excludes the warrants, as they would be anti-dilutive.