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Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Schedule of Restricted Stock Unit [Line Items]  
at IRR of at least 7.5% 45,994cnk_NumberOfSharesVestingAtIrrTargetLevelOfAtLeastSevenPointFivePercent
at IRR of at least 9.5% 91,988cnk_NumberOfSharesVestingAtIrrTargetLevelOfAtLeastNinePointFivePercent
at IRR of at least 11.5% 137,982cnk_NumberOfSharesVestingAtIrrTargetLevelOfAtLeastElevenPointFivePercent
at IRR of at least 7.5% $ 1,991cnk_ValueOfSharesVestingAtIrrTargetLevelOfAtLeastSevenPointFivePercent
at IRR of at least 9.5% 3,981cnk_ValueOfSharesVestingAtIrrTargetLevelOfAtLeastNinePointFivePercent
at IRR of at least 11.5% $ 5,972cnk_ValueOfSharesVestingAtIrrTargetLevelOfAtLeastElevenPointFivePercent