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Statement - CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 995310 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments link:presentationLink link:definitionLink link:calculationLink 995311 - Disclosure - Rate and Regulatory Matters link:presentationLink link:definitionLink link:calculationLink 995312 - Disclosure - Income Taxes link:presentationLink link:definitionLink link:calculationLink 995313 - Disclosure - Commitments and Contingent Liabilities link:presentationLink link:definitionLink link:calculationLink 995314 - Disclosure - Short-Term Borrowings link:presentationLink link:definitionLink link:calculationLink 995315 - Disclosure - Capitalization link:presentationLink link:definitionLink link:calculationLink 995316 - Disclosure - Employee Benefit Plans link:presentationLink link:definitionLink link:calculationLink 995317 - Disclosure - Business Segment Data link:presentationLink link:definitionLink link:calculationLink 995318 - Disclosure - Quarterly Data - Unaudited link:presentationLink link:definitionLink link:calculationLink 996000 - Disclosure - Accounting Policies, by Policy (Policies) link:presentationLink link:definitionLink link:calculationLink 996001 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Tables) link:presentationLink link:definitionLink link:calculationLink 996002 - Disclosure - Rate and Regulatory Matters (Tables) link:presentationLink link:definitionLink link:calculationLink 996003 - Disclosure - Income Taxes (Tables) link:presentationLink link:definitionLink link:calculationLink 996004 - Disclosure - Commitments and Contingent Liabilities (Tables) link:presentationLink link:definitionLink link:calculationLink 996005 - Disclosure - Short-Term Borrowings (Tables) link:presentationLink link:definitionLink link:calculationLink 996006 - Disclosure - Capitalization (Tables) link:presentationLink link:definitionLink link:calculationLink 996007 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:definitionLink link:calculationLink 996008 - Disclosure - Business Segment Data (Tables) link:presentationLink link:definitionLink link:calculationLink 996009 - Disclosure - Quarterly Data - Unaudited (Tables) link:presentationLink link:definitionLink link:calculationLink 996010 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) link:presentationLink link:definitionLink link:calculationLink 996011 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments - Schedule of Range of Depreciation Rates for the Major Utility Plant Categories (Details) link:presentationLink link:definitionLink link:calculationLink 996012 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments - Schedule of AFUDC Rates for Middlesex and Tidewater (Details) link:presentationLink link:definitionLink link:calculationLink 996013 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments - Schedule of Operating Revenues (Details) link:presentationLink link:definitionLink link:calculationLink 996014 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments - Schedule of Issued Accounting Standards (Details) link:presentationLink link:definitionLink link:calculationLink 996015 - Disclosure - Rate and Regulatory Matters (Details) link:presentationLink link:definitionLink link:calculationLink 996016 - Disclosure - Rate and Regulatory Matters - Schedule of Regulatory Assets and Liabilities (Details) link:presentationLink link:definitionLink link:calculationLink 996017 - Disclosure - Income Taxes - Schedule of Income Tax Expense (Benefit) (Details) link:presentationLink link:definitionLink link:calculationLink 996018 - Disclosure - Income Taxes - Schedule of Income Tax Expense (Benefit) is Comprised (Details) link:presentationLink link:definitionLink link:calculationLink 996019 - Disclosure - Income Taxes - Schedule of Deferred Income Taxes Reflect the Net Tax Effect (Details) link:presentationLink link:definitionLink link:calculationLink 996020 - Disclosure - Commitments and Contingent Liabilities (Details) link:presentationLink link:definitionLink link:calculationLink 996021 - Disclosure - Commitments and Contingent Liabilities - Schedule of Purchased Water Costs (Details) link:presentationLink link:definitionLink link:calculationLink 996022 - Disclosure - Commitments and Contingent Liabilities - Schedule of Operating Lease ROU Assets (Details) link:presentationLink link:definitionLink link:calculationLink 996023 - Disclosure - Commitments and Contingent Liabilities - Schedule of Future Minimum Operating Lease Commitments (Details) link:presentationLink link:definitionLink link:calculationLink 996024 - Disclosure - Short-Term Borrowings (Details) link:presentationLink link:definitionLink link:calculationLink 996025 - Disclosure - Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) link:presentationLink link:definitionLink link:calculationLink 996026 - Disclosure - Short-Term Borrowings - Schedule of Lines of Credit (Details) link:presentationLink link:definitionLink link:calculationLink 996027 - Disclosure - Capitalization (Details) link:presentationLink link:definitionLink link:calculationLink 996028 - Disclosure - Capitalization - Schedule of Long-Term Debt (Details) link:presentationLink link:definitionLink link:calculationLink 996029 - Disclosure - Capitalization - Schedule of Basic and Diluted Earnings Per Share (Details) link:presentationLink link:definitionLink link:calculationLink 996030 - Disclosure - Capitalization - Schedule of Basic and Diluted Earnings Per Share (Parentheticals) (Details) link:presentationLink link:definitionLink link:calculationLink 996031 - Disclosure - Capitalization - Schedule of Carrying Amount and Fair Value of the Bonds (Details) link:presentationLink link:definitionLink link:calculationLink 996032 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:definitionLink link:calculationLink 996033 - Disclosure - Employee Benefit Plans - Schedule of Employee Retirement Benefit Plans (Details) link:presentationLink link:definitionLink link:calculationLink 996034 - Disclosure - Employee Benefit Plans - Schedule of Change in Fair Value of Plan Assets (Details) link:presentationLink link:definitionLink link:calculationLink 996035 - Disclosure - Employee Benefit Plans - Schedule of Employee Benefit Plans Recognized in Balance Sheet (Details) link:presentationLink link:definitionLink link:calculationLink 996036 - Disclosure - Employee Benefit Plans - Schedule of Components of Net Benefit Cost (Details) link:presentationLink link:definitionLink link:calculationLink 996037 - Disclosure - Employee Benefit Plans - Schedule of Regulatory Assets into Net Periodic Benefit Cost (Details) link:presentationLink link:definitionLink link:calculationLink 996038 - Disclosure - Employee Benefit Plans - Schedule of Discount and Compensation Rates (Details) link:presentationLink link:definitionLink link:calculationLink 996039 - Disclosure - Employee Benefit Plans - Schedule of Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates (Details) link:presentationLink link:definitionLink link:calculationLink 996040 - Disclosure - Employee Benefit Plans - Schedule of Expected Benefit Payments (Details) link:presentationLink link:definitionLink link:calculationLink 996041 - Disclosure - Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details) link:presentationLink link:definitionLink link:calculationLink 996042 - Disclosure - Employee Benefit Plans - Schedule of Fair Value of Plan Assets (Details) link:presentationLink link:definitionLink link:calculationLink 996043 - Disclosure - Employee Benefit Plans - Schedule of Table Presents Awarded but not Yet Vested Share (Details) link:presentationLink link:definitionLink link:calculationLink 996044 - Disclosure - Business Segment Data (Details) link:presentationLink link:definitionLink link:calculationLink 996045 - Disclosure - Business Segment Data - 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