Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Buckeye growth premiums receivable Growth Premiums Receivable, Current Growth Premiums Receivable, Current Refunds of advances for construction Payment for Advance for Construction, Financing Activity Weighted average number of common shares used in the determination of: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Other accrued liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Accrued Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Accrued Liabilities Less: accumulated depreciation Public Utilities, Property, Plant and Equipment, Accumulated Depreciation Title of 12(b) Security Title of 12(b) Security Carrying Value Reported Value Measurement [Member] Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Medical Benefits Pool Plan Medical Benefits Pool Plan [Member] Medical Benefits Pool Plan Common stock, $0.01 par value, 60,000,000 shares authorized; #N/A and 29,116,183 shares issued, respectively Common Stock, Value, Issued Depreciation, amortization and accretion Depreciation, Amortization and Accretion, Net Payroll Employee-related Liabilities, Current Public Utilities, General Disclosures [Line Items] Public Utilities, General Disclosures [Line Items] Regulated revenue Regulated Operation [Member] Other noncurrent assets Other Assets, Miscellaneous, Noncurrent Prepaid expense Other Prepaid Expense, Current Restatement Determination Date Restatement Determination Date Total contract assets Contract with Customer, Asset, after Allowance for Credit Loss ICFA revenue Infrastructure Coordination And Financing Agreements [Member] Infrastructure coordination and financing agreements Beginning of period End of period Accounts Receivable, Allowance for Credit Loss Regulatory liabilities Regulatory Liability, Noncurrent Amendment Flag Amendment Flag Current Liabilities Liabilities, Current [Abstract] Credit loss expense Accounts Receivable, Credit Loss Expense (Reversal) Accounts payable and other current liabilities Increase (Decrease) in Accounts Payable and Other Operating Liabilities Reportable Segment Reportable Segment [Member] Reportable Segment Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Principal payments under finance lease Finance Lease, Principal Payments Utility plant, net Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Loss Contingencies [Table] Loss Contingencies [Table] Total other liabilities Liabilities, Noncurrent Summary of Allowance for Credit Loss Activity Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] Transactions With Related Parties Related Party Transactions Disclosure [Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province Regulatory Matters Public Utilities Disclosure [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Stop loss medical claims Stop Loss Medical Claims, Current Stop Loss Medical Claims, Current Other Liabilities Liabilities, Noncurrent [Abstract] Intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Other wastewater revenue Other Wastewater Revenues [Member] Other Wastewater Revenues Plant held for future use Public Utilities, Property, Plant And Equipment, Plant Held For Future Use Public Utilities, Property, Plant And Equipment, Plant Held For Future Use Basic (in shares) Basic weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Other Income (Expense) Other Expenses [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Total Capitalization Capitalization, Long-Term Debt and Equity Regulatory assets Regulatory Asset, Noncurrent Loss Contingencies [Line Items] Loss Contingencies [Line Items] Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Entity Address, City or Town Entity Address, City or Town Schedule of Supplemental Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Customer and meter deposits Customer And Meter Deposits, Current Customer and meter deposits. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Growth premium liability Business Combination, Growth Premium Liability Business Combination, Growth Premium Liability Other water revenue Other Water Revenues [Member] Other Water Revenues Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Residential Residential [Member] Residential Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Revenue credits Revenue Credits Revenue Credits Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Long-term debt, current portion Long-Term Debt, Current Maturities Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Capital expenditures included in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Grantee Status [Axis] Grantee Status [Axis] Requested rate, number of phase-in periods Public Utilities, Requested Rate, Phase-In Period Public Utilities, Requested Rate, Phase-In Period Schedule of Significant Expense Segment Reporting [Table Text Block] Related Party Related and Nonrelated Parties [Axis] Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Liabilities And Other Current Liabilities Accrued Liabilities And Other Current Liabilities Schedule of Accrued Expenses and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] Revolver repayments Repayments of Lines of Credit Contract assets Contract with Customer, Asset, after Allowance for Credit Loss [Abstract] Document Period End Date Document Period End Date Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Equity Equity [Text Block] Security Exchange Name Security Exchange Name Utility Plant constructed by developers and conveyed Construction in Progress Expenditures Incurred but Not yet Paid Treasury stock, #N/A and 359,329 shares, respectively Treasury Stock, Common, Value Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Total Liabilities, Fair Value Disclosure Entity Shell Company Entity Shell Company Interest Interest Payable, Current Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol Public utilities, interim rate increase (decrease), amount Public Utilities, Interim Rate Increase (Decrease), Amount Capital expenditures Payments to Acquire Property, Plant, and Equipment Right-of-use assets, net Lease, Right-of-Use Asset Lease, Right-of-Use Asset Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Water service Water Services [Member] Water services. Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Payments allocated to deferred revenue Contract With Customer Liability, Additions Contract With Customer Liability, Additions Schedule Of Business Combination, Recognized Asset Acquired and Liability Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Non-cash financing and investing activities: Noncash Investing and Financing Items [Abstract] ICFA fee liability ICFA Fee Liability ICFA Fee Liability Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] License fees Accrued License Fees, Current Accrued License Fees, Current Credit Facility [Domain] Credit Facility [Domain] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Dividend payable Dividends Payable, Current Individual: Individual [Axis] Diluted (in shares) Diluted weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Public Utility [Axis] Public Utility [Axis] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Schedule of Prepaid Expenses and Other Current Assets Schedule of Other Current Assets [Table Text Block] Total net assets assumed Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Underlying Security Market Price Change Underlying Security Market Price Change, Percent GW-Santa Cruz Rate Case GW-Santa Cruz Rate Case [Member] GW-Santa Cruz Rate Case Revolver borrowings Proceeds from Lines of Credit Deferred income tax expense Deferred Income Taxes and Tax Credits Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Other noncurrent assets Increase (Decrease) in Other Noncurrent Assets Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Other general and administrative expenses Other General and Administrative Expense Award Timing Predetermined Award Timing Predetermined [Flag] Treasury Stock Treasury Stock, Common [Member] Net utility plant Public Utilities, Property, Plant and Equipment, Net Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Public Offering Public Offering [Member] Public Offering Buckeye growth premiums Buckeye growth premiums Growth Premiums Growth Premiums Income tax expense (as a percent) Effective Income Tax Rate Reconciliation, Percent Grantee Status [Domain] Grantee Status [Domain] Personnel costs - operations and maintenance Utilities Operating Expense, Personnel Costs Utilities Operating Expense, Personnel Costs Asset retirement obligation additions Asset Retirement Obligation, Liabilities Incurred Effect of dilutive securities (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Utility [Domain] utility [Domain] [Domain] for utility [Axis] All Executive Categories All Executive Categories [Member] Regulated Operations [Abstract] Regulated Operations [Abstract] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Long-term debt Long-Term Debt, Fair Value Commercial Commercial [Member] Commercial Wastewater and recycled water service Waste Water and Recycled Water [Member] Waste Water and Recycled Water Schedule of Basic and Diluted EPS Calculations Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Total purchase price Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name Debt Instrument, Name [Domain] Business Segment Information Segment Reporting [Text Block] Revolver borrowings Long-Term Line of Credit Number of meters installed Number Of Meters Installed Number Of Meters Installed Expiration Date Trading Arrangement Expiration Date Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Other operations and maintenance expenses Utilities Operating Expense, Other Operations And Maintenance Utilities Operating Expense, Other Operations And Maintenance Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Public Utilities, Regulatory Proceeding [Domain] Public Utilities, Regulatory Proceeding [Domain] Operating cash flows used for operating leases Operating Cash Flows Used For Operating Leases Operating Cash Flows Used For Operating Leases Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Affiliates Affiliated Entity [Member] Requested revenue increase Public Utilities, Requested Rate Increase (Decrease), Amount Business Combination [Line Items] Business Combination [Line Items] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other Income and Expenses [Abstract] Issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Common stock, authorized (in shares) Common Stock, Shares Authorized Accounts receivable Business Combination, Recognized Asset Acquired, Receivable, Current Number of common stock issued (in shares) Sale of Stock, Number of Shares Issued in Transaction Exercise Price Award Exercise Price Related Party Transaction [Axis] Related Party Transaction [Axis] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Irrigation Irrigation [Member] Irrigation Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Debt Debt Disclosure [Text Block] Repayments of long-term debt Repayments of Long-Term Debt Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Business Combination [Table] Business Combination [Table] Equity Component Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Gross proceeds from sale of stock Sale of Stock, Consideration Received on Transaction Billed receivables Accounts Receivable, before Allowance for Credit Loss, Current Adoption Date Trading Arrangement Adoption Date Schedule of Other, Net Schedule of Other Nonoperating Income (Expense) [Table Text Block] Contract liabilities Contract with Customer, Liability [Abstract] Counterparty Name [Domain] Counterparty Name [Domain] Total shareholders’ equity Balance, at the beginning Balance, at the ending Equity, Attributable to Parent Prepaid Expenses and Other Current Assets Other Current Assets [Text Block] Total other expense Nonoperating Income (Expense) Prepaid insurance Prepaid Insurance Assets Assets [Abstract] Regulatory Agency [Axis] Regulatory Agency [Axis] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Return on equity, percentage Public Utilities, Requested Return on Equity, Percentage Professional fees Professional Fees Insider Trading Policies and Procedures [Line Items] Regulatory Agency [Domain] Regulatory Agency [Domain] Accrued Expenses and Other Current Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Other financing activities Proceeds from (Payment for) Other Financing Activity Accounts receivable, allowance for credit losses Less: provision for credit losses Accounts Receivable, Allowance for Credit Loss, Current Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other current assets Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Regulatory assets, current Regulatory Asset, Current Growth premium payable Growth Premium Payable For Each New Meter Installed Growth Premium Payable For Each New Meter Installed Advances in aid of construction Advances In Aid Of Construction Advances In Aid Of Construction Business Combination [Domain] Business Combination [Domain] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Maximum payout of growth premium receivable Maximum Payout Of Growth Premium Receivable Maximum payout of growth premium receivable. Number of operating segments Number of Operating Segments Anti-dilutive shares excluded from earnings per diluted share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Accounts receivable and other current assets Increase (Decrease) in Accounts Receivable and Other Operating Assets RSU Restricted Stock Units (RSUs) [Member] Entity Central Index Key Entity Central Index Key Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Other adjustments Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Business Combination [Axis] Business Combination [Axis] Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Financing cash flows used for finance leases Financing Cash Flows For Finance Leases Financing Cash Flows For Finance Leases Reclassifications from HUF Contract with Customer, Liability, Reclassification From HUF Contract with Customer, Liability, Reclassification From HUF Operating Expenses Segment Expenses Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Basis spread on variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code Restricted stock awards RSA Restricted Stock [Member] All Individuals All Individuals [Member] AIAC refunds, current portion AIAC Refunds, Current AIAC Refunds, Current Dividends paid Payments of Dividends Recycled water revenue Recycled Water Revenues [Member] Recycled Water Revenues Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total Assets Assets Estimated rate base Public Utilities, Property, Plant And Equipment, Estimated Rate Base Public Utilities, Property, Plant And Equipment, Estimated Rate Base Schedule of Share-based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Share-based Compensation Share-Based Payment Arrangement [Text Block] Issuance of common stock, net (in shares) Stock Issued During Period, Shares, New Issues PEO PEO [Member] Other taxes Accrual for Taxes Other than Income Taxes, Current Total share-based compensation Share-Based Payment Arrangement, Expense Measurement Basis [Axis] Measurement Basis [Axis] Unregulated revenue Unregulated Revenue [Member] Unregulated Revenue Other noncurrent liabilities Other Liabilities, Noncurrent Goodwill Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Cash and cash equivalents Cash Equivalents, at Carrying Value Unregulated revenue Revenue recognized Contract with Customer, Liability, Revenue Recognized Payables and Accruals [Abstract] Retained Deficit Retained Earnings [Member] Total operating expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] AFUDC-Equity Public Utilities, Allowance for Funds Used During Construction, Additions Cash Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Award Timing Disclosures [Line Items] Financing costs of debt and equity transactions Payments of Debt Issuance Costs Diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Liabilities: Liabilities, Fair Value Disclosure [Abstract] Schedule of Carrying Amount and Estimated Fair Values Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Requested deferral of recovery of acquisition premium Public Utilities, Requested Deferral Of Recovery Of Acquisition Premium, Amount Public Utilities, Requested Deferral Of Recovery Of Acquisition Premium, Amount Operations and maintenance Utilities Operating Expense, Maintenance and Operations Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Write offs Accounts Receivable, Allowance for Credit Loss, Writeoff Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Share-Based Payment Arrangement [Abstract] Advances and contributions in aid of construction Proceeds from Advance for and Contribution in Aid of Construction, Financing Activity Total revenue Segment Revenue Revenue from Contract with Customer, Excluding Assessed Tax Facility fee on unused amount of line of credit (as a percent) Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Number of accounts established Number Of Accounts Established Number Of Accounts Established Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Fair Value Estimate of Fair Value Measurement [Member] Revenue Recognition Revenue from Contract with Customer [Text Block] Issuance of common stock, net Stock Issued During Period, Value, New Issues Underwriter Over-Allotment Option [Member] HUF transferred to CIAC Hook Up Fee Transferred To Contributions In Aid Of Construction Hook Up Fee Transferred To Contributions In Aid Of Construction Segment Reporting [Table] Segment Reporting [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Sale of Stock [Axis] Sale of Stock [Axis] Cash Flows from Investing Activities: Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Contingent consideration, current portion Business Combination, Contingent Consideration, Liability, Current Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Other Income (Expense) Other Nonoperating Income (Expense) [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating Income Operating Income (Loss) Leases, current portion Lease, Liability, Current Lease, Liability, Current GW-Ocotillo GW-Ocotillo [Member] GW-Ocotillo Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Other Other Income (Loss) Disclosure, Nonoperating Other Income (Loss) Disclosure, Nonoperating Medical claims Medical Claims Liability, Current Medical Claims Liability, Current Related Party Transaction [Domain] Related Party Transaction [Domain] Acquisitions Business Combination [Text Block] Construction cost included in rate base Public Utilities, Property, Plant and Equipment, Amount of Construction Work in Process Included in Rate Base Dividend declared per share Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Dividends declared per common share (in dollars per share) Dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Share-based compensation Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Utilities, chemicals and repairs Utilities Operating Expense, Utilities, Chemicals And Repairs Utilities Operating Expense, Utilities, Chemicals And Repairs Operating cash flows used for finance leases Operating Cash Flows Used For Finance Leases Operating Cash Flows Used For Finance Leases Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock, issued (in shares) Balance at the beginning (in shares) Balance at the ending (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Private Placement Offering Private Placement Offering [Member] Private Placement Offering Treasury stock (in shares) Balance at the beginning (in shares) Balance at the ending (in shares) Treasury Stock, Common, Shares Accumulated growth premiums received Accumulated Growth Premiums Received Accumulated Growth Premiums Received Equity Components Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Cash paid for income taxes Income Tax Paid, after Refund Received Class of Stock [Line Items] Class of Stock [Line Items] Contributions in aid of construction, net Contributions in Aid of Construction Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Capitalization Capitalization, Long-Term Debt and Equity [Abstract] Entity Interactive Data Current Entity Interactive Data Current Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred income tax liabilities, net Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Utility Plant Public Utilities, Property, Plant and Equipment, Plant in Service Termination Date Trading Arrangement Termination Date Utility Plant [Domain] Utility Plant [Domain] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Total other assets Other Assets, Noncurrent Cash Flows from Financing Activities: Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] Document Type Document Type Long-term lease liabilities Lease, Liability, Noncurrent Lease, Liability, Noncurrent Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value as of Grant Date Award Grant Date Fair Value Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Beginning of period End of period Contract with Customer, Liability, Noncurrent Water Plant Water Plant [Member] Red Rock Utilities Red Rock Utilities [Member] Red Rock Utilities [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Basis of Presentation and Recent Accounting Pronouncements Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Income Before Income Taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Refer to Note 14) Commitments and Contingencies Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Other Assets Other Assets [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Construction Construction Water Services [Member] Construction Water Services Changes in assets and liabilities Increase (Decrease) in Operating Liabilities [Abstract] Counterparty Name [Axis] Counterparty Name [Axis] Capitalization and Liabilities Liabilities and Equity [Abstract] Schedule of Financial Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] Supplemental disclosure of cash flow information: Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Multi-family Multi-Family Customer [Member] Multi-Family Customer PEO Name PEO Name Tucson Water Tucson Water [Member] Tucson Water Total contract liabilities Contract with Customer, Liability Northern Trust Loan Agreement Northern Trust Loan Agreement [Member] Northern Trust Loan Agreement Other segment income and expenses Segment Reporting, Other Segment Item, Amount Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Farmers Water Company Farmers Water Company [Member] Farmers Water Company Allowance for doubtful accounts [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Interest expense Interest Expense, Debt Valencia Water Company Valencia Water Company [Member] Valencia Water Company [Member] Regulation Status [Axis] Regulation Status [Axis] Number of active water connections Active Water Connections Active Water Connections Requested equity capital structure (as a percent) Public Utilities, Requested Equity Capital Structure, Percentage Cash, cash equivalents, and restricted cash — Beginning of period Cash, cash equivalents, and restricted cash — End of period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Period for maximum payout of growth premium receivable Period For Maximum Payout Of Growth Premium Receivable Period for maximum payout of growth premium receivable. Other accrued liabilities Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Restricted cash Restricted Cash and Cash Equivalent, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Amount disallowed Public Utilities, Property, Plant and Equipment, Amount of Disallowed Costs for Recently Completed Plant Employee Share-Based Payment Arrangement, Employee [Member] Debt Instrument Debt Instrument [Axis] Growth premium, obligation period, after establishment of new account Growth Premium, Obligation Period, After Establishment Of New Account Growth Premium, Obligation Period, After Establishment Of New Account Share-based compensation Share-Based Payment Arrangement, Noncash Expense Personnel costs - general and administrative Labor and Related Expense Regulated and Unregulated Operation [Domain] Regulated and Unregulated Operation [Domain] Public Utilities, Regulatory Proceeding [Axis] Public Utilities, Regulatory Proceeding [Axis] ACC Arizona Corporation Commission (ACC) [Member] Arizona Corporation Commission (ACC) Growth premium, obligation period, after closing date Growth Premium, Obligation Period, After Closing Date Growth Premium, Obligation Period, After Closing Date Amount of related party transaction Related Party Transaction, Amounts of Transaction Deferred revenue - ICFA Contract With Customer, Liability, Infrastructure Coordination And Financing Agreements Contract With Customer, Liability, Infrastructure Coordination And Financing Agreements Customer [Domain] Customer [Domain] Basic earnings per common share (in dollars per share) Earnings Per Share, Basic Customer prepayments Contract with Customer, Liability, Current Hook-up fee liabilities Hook-up Fee Liabilities Hook-up Fee Liabilities Total current assets Assets, Current Insider Trading Arrangements [Line Items] Long-term debt, net Long-Term Debt, Excluding Current Maturities Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowance for credit losses of $— and $244, respectively Accounts receivable, net Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Retained deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Number of common stock to be issued and sold (in shares) Sale Of Stock, Number Of Shares To Be Issued In Transaction Sale Of Stock, Number Of Shares To Be Issued In Transaction Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Contingent Consideration Business Combination, Contingent Consideration, Liability Wastewater and recycled water service Wastewater And Recycled Water [Member] waste water and recycled water [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Deferred revenue - ICFA Deferred Revenue, Noncurrent Public Utilities General Disclosures [Table] Public Utilities General Disclosures [Table] Equity Awards Adjustments Equity Awards Adjustments [Member] ACC assessment fee Assessment Fee Liability, Current Assessment Fee Liability, Current Number of water systems acquired Business Combination, Number of Businesses Acquired Total Capitalization and Liabilities Liabilities and Equity Growth premium, obligation period, from acquisition date Growth Premium, Obligation Period, From Acquisition Date Growth Premium, Obligation Period, From Acquisition Date Option grants Stock Option Share-Based Payment Arrangement, Option [Member] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party Related and Nonrelated Parties [Domain] Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Restricted cash Restricted Cash and Cash Equivalent, Noncurrent Other noncurrent liabilities Increase (Decrease) in Other Noncurrent Liabilities Other, net Total Other, net Other Nonoperating Income (Expense) Prepaid income tax Income Taxes Receivable, Current Name Awards Close in Time to MNPI Disclosures, Individual Name Unbilled revenue Accrued Fees and Other Revenue Receivable Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] General and administrative General and Administrative Expense Purchase price (in dollars per share) Sale of Stock, Price Per Share Deferred Revenue Roll Forward: Deferred Revenue Roll forward [Roll Forward] Deferred Revenue Roll forward Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest - net of amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Utility [Axis] Utility [Axis] Utility Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Unregulated revenue Unregulated Operation [Member] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Growth premium receivable for each new water meter installed Growth Premium Receivable For Each New Water Meter Installed Growth premium receivable for each new water meter installed. Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Business combination, consideration transferred Business Combination, Consideration Transferred Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Operating lease expense Operating Lease, Expense Number of regulatory rate cases Public Utilities, Number of Regulatory Rate Cases Public Utilities, Number of Regulatory Rate Cases Company Selected Measure Amount Company Selected Measure Amount Share-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Stock, Class of Stock [Table] Stock, Class of Stock [Table] AFUDC-Equity Allowance For Equity Funds Used During Construction Allowance For Equity Funds Used During Construction Current Assets Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Income tax expense Income tax expense Income Tax Expense (Benefit) Other, Net Other Income and Other Expense Disclosure [Text Block] Project liabilities Accrued Project Liabilities, Current Accrued Project Liabilities, Current Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Increase (Decrease) in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net Income Net Income (Loss) Net income Net Income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Regulatory Liabilities, current Regulatory Liability, Current Nonemployee Share-Based Payment Arrangement, Nonemployee [Member] Interest income Investment Income, Interest Schedule of Contract Assets, Liabilities and Deferred Revenue Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Revenue Revenues [Abstract] Recoveries Accounts Receivable, Allowance for Credit Loss, Recovery Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]