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Discontinued Operations - Additional Information (Details) (USD $)
In Thousands, except Share data in Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Aug. 31, 2012
Dec. 31, 2012
Discontinued Operations And Disposal Groups [Abstract]    
Proceeds from Divestiture of Businesses, Net of Cash Divested $ 2,400us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested $ 2,364us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Noncash or Part Noncash Divestiture, Shares Received (in Shares) 9.6cak_NoncashOrPartNoncashDivestitureSharesReceived  
Noncash or Part Noncash Divestiture, Amount of Consideration Received $ 1,900us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1 $ 1,877us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1