Treasury Stock and Share-Based Awards - Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($) shares in Thousands, $ in Millions		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023
Restricted Stock (Member)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units that vested during the period		880
Fair value of performance stock units that vested during the period		$ 14.7	$ 9.2
Compensation expense recognized during the period		8.5	8.3
Income tax expense related to performance stock units		2.4	$ 1.0
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense	[1]	$ 24.5
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units that vested during the period		100	100
Fair value of performance stock units that vested during the period		$ 2.1	$ 1.4
Accumulated dividends paid upon vesting of performance stock units		0.1	0.2
Compensation expense recognized during the period	[2]	7.2	4.2
Income tax expense related to performance stock units		(0.7)	(0.2)
Cinemark Holdings Inc [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized during the period		0.7
Cinemark Holdings Inc [Member] | Restricted Stock (Member)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of performance stock units that vested during the period		1.4	1.3
Compensation expense recognized during the period			0.6
Income tax expense related to performance stock units		0.3	0.3
Cinemark Holdings Inc [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense		1.3
Cinemark Partners Second [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense recognized during the period		7.8
Cinemark Partners Second [Member] | Restricted Stock (Member)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of performance stock units that vested during the period		13.3	7.9
Compensation expense recognized during the period			7.7
Income tax expense related to performance stock units		2.1	$ 0.7
Cinemark Partners Second [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense	[1]	$ 23.2

[1] The weighted average period over which this remaining compensation expense will be recognized by both Holdings and CUSA is approximately 1.7 years.

[2] Compensation expense for the six months ended June 30, 2024 includes approximately $2.3 related to a change in the most likely performance metrics outcome estimated to be achieved for the 2023 and 2024 grants.