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v3.22.1

Summary of Changes in Stockholders Equity (Parenthetical) (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Shareholders Equity [Line Items] |
Impact of adoption of ASU 2020-06, net of deferred taxes | $ 23.8

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- Definition Cumulative effect on retained earnings, tax. + References No definition available. + Details
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Namespace Prefix: | cnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Shareholders Equity [Line Items] + References No definition available. + Details
Name: | cnk_ShareholdersEquityLineItems
Namespace Prefix: | cnk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration