Annual report pursuant to Section 13 and 15(d)

Summary of Treasury Stock Activity (Parenthetical) (Detail)

v2.4.1.9
Summary of Treasury Stock Activity (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Treasury Stock [Line Items]      
Common stock repurchased value as result of restricted stock forfeitures and canceled $ 0.001cnk_CommonStockRepurchasedValueAsResultOfRestrictedStockForfeituresAndCanceled $ 0.001cnk_CommonStockRepurchasedValueAsResultOfRestrictedStockForfeituresAndCanceled $ 0.001cnk_CommonStockRepurchasedValueAsResultOfRestrictedStockForfeituresAndCanceled
Minimum      
Schedule of Treasury Stock [Line Items]      
Market Value of Restricted Shares $ 22.40cnk_MarketValueOfRestrictedSharesWithheld
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= us-gaap_MinimumMember
$ 22.40cnk_MarketValueOfRestrictedSharesWithheld
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 22.40cnk_MarketValueOfRestrictedSharesWithheld
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum      
Schedule of Treasury Stock [Line Items]      
Market Value of Restricted Shares $ 30.83cnk_MarketValueOfRestrictedSharesWithheld
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= us-gaap_MaximumMember
$ 30.83cnk_MarketValueOfRestrictedSharesWithheld
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
$ 30.83cnk_MarketValueOfRestrictedSharesWithheld
/ us-gaap_RangeAxis
= us-gaap_MaximumMember