XML 61 R50.htm IDEA: XBRL DOCUMENT
v3.25.3

Employee Benefit Plans - Amounts Included in Regulatory Asset and Accumulated Other Comprehensive Income/Loss Recognized as Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Florida Public Utilities Company Pension Plan [Member] |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.2

X
- Definition Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] + References No definition available. + Details
Name: | cpk_DefinedBenefitPlansAndOtherPostretirementBenefitPlansLineItems
Namespace Prefix: | cpk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_DefinedBenefitPlanActuarialGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=cpk_FloridaPublicUtilitiesCompanyPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |