Annual report pursuant to Section 13 and 15(d)

Dividends (Parenthetical) (Detail)

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Dividends (Parenthetical) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dividend Declared [Line Items]      
Dividends related to outstanding restricted stock units $ 530cnk_DividendsAccruedOnUnvestedRestrictedStockUnits $ 772cnk_DividendsAccruedOnUnvestedRestrictedStockUnits $ 894cnk_DividendsAccruedOnUnvestedRestrictedStockUnits
Effective Date of change in amount of quarterly dividend Aug. 15, 2013    
Revised quarterly dividend $ 0.25cnk_RevisedQuarterlyDividend