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Supplemental Cash Flow Disclosures - Non-Cash Investing and Financing Activities (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure Supplemental Cash Flow Disclosures Noncash Investing And Financing Activities [Abstract]      
Capital property and equipment acquired on account, but not paid as of December 31 $ 459us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 341us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 7,065us-gaap_CapitalExpendituresIncurredButNotYetPaid
Retirement Savings Plan 602cpk_NonCashRetirementSavingsPlanExpenses 0cpk_NonCashRetirementSavingsPlanExpenses 0cpk_NonCashRetirementSavingsPlanExpenses
Conversion of Debentures 535us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities 295us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities 186us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Performance Incentive Plan 958cpk_NonCashPerformanceIncentivePlanExpenses 355cpk_NonCashPerformanceIncentivePlanExpenses 427cpk_NonCashPerformanceIncentivePlanExpenses
Director Stock Compensation Plan 575cpk_NonCashDirectorStockCompensationPlanExpenses 495cpk_NonCashDirectorStockCompensationPlanExpenses 443cpk_NonCashDirectorStockCompensationPlanExpenses
Capital Lease Obligation $ 6,130us-gaap_CapitalLeaseObligationsIncurred $ 7,126us-gaap_CapitalLeaseObligationsIncurred $ 0us-gaap_CapitalLeaseObligationsIncurred