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Long-Term Debt - Additional Information (Detail) (USD $)
 12 Months Ended 2 Months Ended
Dec. 31, 2014
Feb. 28, 2014
Dec. 31, 2013
Jun. 30, 2011
Jun. 30, 2010
Sep. 05, 2013
Debt Instrument [Line Items]            
Long-term debt maturities repayment of principal in next twelve months $ 9,109,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths          
Long-term debt maturities repayment of principal in year two 9,151,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo          
Long-term debt maturities repayment of principal in year three 12,099,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree          
Long-term debt maturities repayment of principal in year four 9,421,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour          
Long-term debt maturities repayment of principal in year five 11,245,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive          
Long-term debt maturities repayment of principal in year five thereafter 116,600,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive          
Long Term Debt Commitment         36,000,000cpk_LongTermDebtCommitment  
Long-term Debt 161,500,000us-gaap_LongTermDebt   122,000,000us-gaap_LongTermDebt      
Debt Instrument, Number of Series       2cpk_DebtInstrumentNumberofSeries    
Long-term Debt and Capital Lease Obligations 167,595,000us-gaap_LongTermDebtAndCapitalLeaseObligations   128,945,000us-gaap_LongTermDebtAndCapitalLeaseObligations      
Percentage of equity of total capitalization 40.00%cpk_CommonStockEquityToTotalCapitalization          
Fixed charge coverage ratio 1.2cpk_RequiredFixedChargeCoverageRatio          
Debt Instrument, Restrictive Covenants, Required Net Book Value of Regulated Business Assets Percentage of Consolidated Total Assets 50.00%cpk_DebtInstrumentRestrictiveCovenantsRequiredNetBookValueofRegulatedBusinessAssetsPercentageofConsolidatedTotalAssets          
Maximum limit on payment of dividends 10.0          
Cumulative consolidated net income base 243,800,000cpk_CumulativeConsolidatedNetIncome          
Cumulative net income with restrictions 80,900,000cpk_RestrictedPayment          
Cumulative net income free of restrictions 162,900,000cpk_UnrestrictedPayment          
Restricted net assets of consolidated subsidiaries 49,400,000us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries          
Percentage of restricted net assets 16.00%us-gaap_RestrictedInvestmentsPercentOfNetAssets          
Uncollateralized Senior Note Due On Two Thousand Twenty Six [Member]            
Debt Instrument [Line Items]            
Long-term debt, interest percentage 5.68%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNoteDueOnTwoThousandTwentySixMember		          
Long-term Debt 29,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNoteDueOnTwoThousandTwentySixMember		   29,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNoteDueOnTwoThousandTwentySixMember		      
Debt Instrument, Maturity Date Jun. 30, 2026          
First Mortgage Bond Due On Two Thousand Twenty Two [Member]            
Debt Instrument [Line Items]            
Long-term debt, interest percentage 9.08%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cpk_FirstMortgageBondDueOnTwoThousandTwentyTwoMember		          
Long-term Debt 7,969,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_FirstMortgageBondDueOnTwoThousandTwentyTwoMember		   7,967,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_FirstMortgageBondDueOnTwoThousandTwentyTwoMember		      
Debt Instrument, Maturity Date Jun. 01, 2022          
Maximum limit on payment of dividends 2500000          
Cumulative consolidated net income base 104,100,000cpk_CumulativeConsolidatedNetIncome
/ us-gaap_DebtInstrumentAxis
= cpk_FirstMortgageBondDueOnTwoThousandTwentyTwoMember		          
Cumulative net income with restrictions 37,600,000cpk_RestrictedPayment
/ us-gaap_DebtInstrumentAxis
= cpk_FirstMortgageBondDueOnTwoThousandTwentyTwoMember		          
Cumulative net income free of restrictions 66,500,000cpk_UnrestrictedPayment
/ us-gaap_DebtInstrumentAxis
= cpk_FirstMortgageBondDueOnTwoThousandTwentyTwoMember		          
Aggregate Unsecured Senior Notes [Member]            
Debt Instrument [Line Items]            
Long Term Debt Commitment           70,000,000cpk_LongTermDebtCommitment
/ us-gaap_DebtInstrumentAxis
= cpk_AggregateUnsecuredSeniorNotesMember
Uncollateralized Senior Notes Due On May Two Thousand Twenty Eight [Member]            
Debt Instrument [Line Items]            
Long-term debt, interest percentage 6.43%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNotesDueOnMayTwoThousandTwentyEightMember		          
Long-term Debt 7,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNotesDueOnMayTwoThousandTwentyEightMember		   7,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNotesDueOnMayTwoThousandTwentyEightMember		      
Debt Instrument, Maturity Date May 02, 2028          
Uncollateralized Senior Note Two Due on December Two Thousand Twenty Eight [Member]            
Debt Instrument [Line Items]            
Long-term debt, interest percentage 3.73%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEightMember		   3.73%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEightMember		      
Long-term Debt 20,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEightMember		   20,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEightMember		      
Debt Instrument, Maturity Date Dec. 16, 2028          
Uncollateralized Senior Notes Due On Two Thousand Twenty Nine [Member]            
Debt Instrument [Line Items]            
Long-term debt, interest percentage 3.88%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNotesDueOnTwoThousandTwentyNineMember		          
Long-term Debt 50,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNotesDueOnTwoThousandTwentyNineMember		   0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= cpk_UncollateralizedSeniorNotesDueOnTwoThousandTwentyNineMember		      
Debt Instrument, Maturity Date May 15, 2029          
Convertible Debt Securities [Member]            
Debt Instrument [Line Items]            
Conversion price of debt instrument $ 17.01us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= us-gaap_ConvertibleDebtSecuritiesMember		          
Carrying amount of convertible debt instrument 296,000us-gaap_ConvertibleDebt
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= us-gaap_ConvertibleDebtSecuritiesMember		          
Total debentures redeemed for cash   109,000us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= us-gaap_ConvertibleDebtSecuritiesMember		        
Debt Conversion, Converted Instrument, Amount   $ 537,000us-gaap_DebtConversionConvertedInstrumentAmount1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= us-gaap_ConvertibleDebtSecuritiesMember