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v3.20.2

Summary of Treasury Stock Activity (Parenthetical) (Detail) | 6 Months Ended
--- | ---
Jun. 30, 2020 $ / shares
Minimum |
Schedule of Treasury Stock [Line Items] |
Market Value of Restricted Shares | $ 8.03
Maximum |
Schedule of Treasury Stock [Line Items] |
Market Value of Restricted Shares | $ 32.12

X
- Definition Market value per share of restricted shares withheld by company related to restricted stock vesting + References No definition available. + Details
Name: | cnk_MarketValueOfRestrictedSharesWithheld
Namespace Prefix: | cnk_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Treasury Stock [Line Items] + References No definition available. + Details
Name: | cnk_ScheduleOfTreasuryStockLineItems
Namespace Prefix: | cnk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |