Treasury Stock and Share Based Awards - Summary of Restricted Stock and Restricted Stock Unit Award Activity (Detail) - USD ($) shares in Thousands, $ in Millions		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Restricted Stock (Member)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted stock units that vested during the period		720
Fair value of restricted stock units that vested during the period		$ 9.4	$ 15.2
Compensation expense recognized during the period		12.5	12.0
Income tax (expense) benefit related to performance stock units		0.9	$ 2.5
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense	[1]	$ 22.6
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 restricted stock units that vested during the period		$ 1.5	$ 1.7
Accumulated dividends paid upon vesting of restricted stock units		0.2	0.3
Compensation expense recognized during the period		6.4	4.2
Income tax (expense) benefit related to performance stock units		0.5	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 units that vested during the period		1.3	0.6
Compensation expense recognized during the period		0.9	0.7
Income tax (expense) benefit related to performance stock units		0.3	0.1
Cinemark Holdings Inc [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense		1.0
Cinemark Partners Second [Member] | Restricted Stock (Member)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock units that vested during the period		8.1	14.6
Compensation expense recognized during the period		11.6	11.3
Income tax (expense) benefit related to performance stock units		0.6	$ 2.4
Cinemark Partners Second [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated remaining expense	[1]	$ 21.6

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