XML 140 R119.htm IDEA: XBRL DOCUMENT
v3.20.4

Summary of Treasury Stock Activity (Parenthetical) (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Treasury Stock [Line Items] |  |  |
Common stock repurchased value as result of restricted stock forfeitures | $ 0.001 | $ 0.001 | $ 0.001
Minimum |  |  |
Schedule of Treasury Stock [Line Items] |  |  |
Market Value of Restricted Shares | 8.03 | 8.03 | 8.03
Maximum |  |  |
Schedule of Treasury Stock [Line Items] |  |  |
Market Value of Restricted Shares | $ 44.44 | $ 44.44 | $ 44.44

X
- Definition Common stock repurchased value as result of restricted stock Forfeitures + References No definition available. + Details
Name: | cnk_CommonStockRepurchasedValueAsResultOfRestrictedStockForfeitures
Namespace Prefix: | cnk_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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: |