Dividends (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Dividends related to outstanding restricted stock units	$ 256	$ 670	$ 624

Amount of dividends accrued on unvested restricted stock units to be paid upon vesting.

No definition available.

Name:	cnk_DividendsAccruedOnUnvestedRestrictedStockUnits
Namespace Prefix:	cnk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration