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Income Taxes - Schedule of Accumulated Deferred Income Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax liabilities:    
Property, plant and equipment $ 152,877us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 134,414us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Acquisition adjustment 16,140cpk_DeferredIncomeTaxOnAcquisitionAdjustment 16,790cpk_DeferredIncomeTaxOnAcquisitionAdjustment
Loss on reacquired debt 529us-gaap_DeferredTaxLiabilitiesDeferredExpense 573us-gaap_DeferredTaxLiabilitiesDeferredExpense
Deferred gas costs 2,222cpk_DeferredTaxLiabilitiesLossOnReacquiredDebt 607cpk_DeferredTaxLiabilitiesLossOnReacquiredDebt
Other 4,507us-gaap_DeferredTaxLiabilitiesOther 2,850us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities 176,275us-gaap_DeferredTaxLiabilities 155,234us-gaap_DeferredTaxLiabilities
Deferred income tax assets:    
Pension and other employee benefits 6,532us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 5,390us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Environmental costs 2,313cpk_DeferredTaxAssetsEnvironmental 2,083cpk_DeferredTaxAssetsEnvironmental
Net operating loss carryforwards 1,186us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 1,444us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Self insurance 275cpk_DeferredTaxAssetSelfInsuranceAccruals 403cpk_DeferredTaxAssetSelfInsuranceAccruals
Storm reserve liability 1,150us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 1,109us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Other 3,755us-gaap_DeferredTaxAssetsOther 3,904us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 15,211us-gaap_DeferredTaxAssetsGross 14,333us-gaap_DeferredTaxAssetsGross
Deferred Income Taxes Per Consolidated Balance Sheets $ 161,064us-gaap_DeferredTaxAssetsLiabilitiesNet $ 140,901us-gaap_DeferredTaxAssetsLiabilitiesNet