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v3.19.3.a.u2

Dividends (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |  |  |
Dividends related to outstanding restricted stock units | $ 670 | $ 624 | $ 558

X
- Definition Amount of dividends accrued on unvested restricted stock units to be paid upon vesting. + References No definition available. + Details
Name: | cnk_DividendsAccruedOnUnvestedRestrictedStockUnits
Namespace Prefix: | cnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration