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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Oct. 31, 2009
Aug. 30, 2010
Dec. 02, 2013
Jun. 07, 2013
Goodwill [Line Items]                
Goodwill $ 4,952,000us-gaap_Goodwill $ 4,354,000us-gaap_Goodwill            
Amortization of intangible assets 396,000us-gaap_AmortizationOfIntangibleAssets 373,000us-gaap_AmortizationOfIntangibleAssets 329,000us-gaap_AmortizationOfIntangibleAssets          
Amortization of intangible assets, 2014 350,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths              
Amortization of intangible assets, 2015 325,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo              
Amortization of intangible assets, 2016 323,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree              
Amortization of intangible assets, 2017 323,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour              
Amortization of intangible assets, 2018 323,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive              
Regulated Energy                
Goodwill [Line Items]                
Goodwill 3,354,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_RegulatedEnergyMember
2,790,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_RegulatedEnergyMember
           
Unregulated Energy                
Goodwill [Line Items]                
Goodwill 1,598,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_UnregulatedEnergyMember
1,564,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_UnregulatedEnergyMember
           
Goodwill, Impairment Loss       237,000us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_UnregulatedEnergyMember
       
FPU | Regulated Energy                
Goodwill [Line Items]                
Goodwill         2,500,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_FloridaPublicUtilitiesCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_RegulatedEnergyMember
     
Indiantown Gas Company | Regulated Energy                
Goodwill [Line Items]                
Goodwill 746,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_IndiantownGasCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_RegulatedEnergyMember
        170,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_IndiantownGasCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_RegulatedEnergyMember
   
Regulatory assets 576,000cpk_GoodwillFromAcquisitionReclassedtoRegulatoryAssets
/ us-gaap_BusinessAcquisitionAxis
= cpk_IndiantownGasCompanyMember
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_RegulatedEnergyMember
             
Fort Meade                
Goodwill [Line Items]                
Goodwill           714,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_FortMeadeMember
714,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_FortMeadeMember
 
Crescent Propane Inc | Unregulated Energy                
Goodwill [Line Items]                
Goodwill     200,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_CrescentPropaneIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_UnregulatedEnergyMember
         
Sharp Energy Inc | Unregulated Energy                
Goodwill [Line Items]                
Goodwill 674,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_SharpEnergyIncMember
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_UnregulatedEnergyMember
             
Glades                
Goodwill [Line Items]                
Goodwill 724,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_GladesMember
             
Glades | Unregulated Energy                
Goodwill [Line Items]                
Goodwill 724,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_GladesMember
/ us-gaap_StatementBusinessSegmentsAxis
= cpk_UnregulatedEnergyMember
             
Austin Cox                
Goodwill [Line Items]                
Goodwill               237,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cpk_AustinCoxMember
Virginia LP Gas, Inc. | Maximum                
Goodwill [Line Items]                
Amortized period of acquired intangible assets 40 years              
Customer list | Minimum                
Goodwill [Line Items]                
Amortized period of acquired intangible assets 7 years              
Customer list | Maximum                
Goodwill [Line Items]                
Amortized period of acquired intangible assets 12 years              
Non-Compete Agreements                
Goodwill [Line Items]                
Amortized period of acquired intangible assets 7 years              
Impairment of Intangible Assets (Excluding Goodwill) $ 175,000us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember