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Employee Benefit Plans - Schedule of Assets by Investment Type (Detail)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Chesapeake Pension Plan      
Asset Category      
Percentage of assets by investment type 100.00%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember		 100.00%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember		 100.00%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember
Chesapeake Pension Plan | Investments in equity securities      
Asset Category      
Percentage of assets by investment type 51.42%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember		 54.40%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember		 52.07%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember
Chesapeake Pension Plan | Debt securities      
Asset Category      
Percentage of assets by investment type 37.31%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember		 36.54%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember		 38.00%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember
Chesapeake Pension Plan | Other      
Asset Category      
Percentage of assets by investment type 11.27%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember		 9.06%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember		 9.93%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_ChesapeakePensionPlanMember
FPU Pension Plan      
Asset Category      
Percentage of assets by investment type 100.00%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember		 100.00%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember		 100.00%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember
FPU Pension Plan | Investments in equity securities      
Asset Category      
Percentage of assets by investment type 52.62%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember		 55.02%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember		 52.81%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember
FPU Pension Plan | Debt securities      
Asset Category      
Percentage of assets by investment type 37.69%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember		 36.54%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember		 38.04%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_DebtSecuritiesMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember
FPU Pension Plan | Other      
Asset Category      
Percentage of assets by investment type 9.69%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember		 8.44%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember		 9.15%cpk_DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= cpk_FloridaPublicUtilitiesCompanyPensionPlanMember