Summary of Treasury Stock Activity (Parenthetical) (Detail)	6 Months Ended
Jun. 30, 2021 $ / shares
Minimum
Schedule of Treasury Stock [Line Items]
Market Value of Restricted Shares	$ 17.41
Maximum
Schedule of Treasury Stock [Line Items]
Market Value of Restricted Shares	$ 24.14

Market value per share of restricted shares withheld by company related to restricted stock vesting

No definition available.

Name:	cnk_MarketValueOfRestrictedSharesWithheld
Namespace Prefix:	cnk_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration