Treasury Stock and Share-Based Awards - Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2025		Mar. 31, 2024
Restricted Stock (Member)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance stock units that vested during the period		1,180
Fair value of restricted stock that vested during the period		$ 35.1		$ 12.5
Compensation expense recognized during the period		4.5		4.2
Income tax benefit related to vested restricted stock		6.7		$ 2.2
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense	[1]	$ 26.5
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance stock units that vested during the period		800		100
Fair value of restricted stock that vested during the period		$ 20.6		$ 2.1
Accumulated dividends paid upon vesting of performance stock units		0.1		0.1
Compensation expense recognized during the period		3.5		2.2
Income tax benefit related to vested restricted stock		3.6		0.1
Cinemark Holdings Inc [Member] | Restricted Stock (Member)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock that vested during the period		0.0		0.0
Compensation expense recognized during the period		0.3		0.0
Income tax benefit related to vested restricted stock				0.4
Cinemark Holdings Inc [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense		0.3
Cinemark Partners Second [Member] | Restricted Stock (Member)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock that vested during the period		35.1		3.8	[2]
Compensation expense recognized during the period		4.2	[2]	12.5
Income tax benefit related to vested restricted stock		6.7		$ 2.2
Cinemark Partners Second [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense		$ 26.2

[1] The weighted average period over which this remaining compensation expense will be recognized by both Holdings and CUSA is approximately 1.8 years.

[2] Compensation expense for the three months ended March 31, 2025 includes approximately $0.3 related to a portion of the short-term field incentive compensation plan for 2025 to be settled in restricted stock.