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Summary of Significant Accounting Policies - Regulatory Rate Filings (Details) |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |
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Jan. 15, 2021 USD ($) | Jan. 05, 2021 | Nov. 23, 2020 USD ($) | Oct. 28, 2020 USD ($) | Jan. 22, 2020 | Jan. 20, 2020 USD ($) | Jan. 01, 2019 USD ($) ft³ | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 04, 2021 USD ($) | Apr. 10, 2020 USD ($) | Feb. 07, 2020 | Jan. 28, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  | $ 8,324,000 | $ 962,000 |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  | 2,516,000 | (4,984,000) |  |  |  |  |
Regulatory Balancing and Memorandum Accounts, Net Under-Collected |  |  |  |  |  |  |  | 1,586,000 |  |  |  |  |  |
Refunds (Collections) Adjustments |  |  |  |  |  |  |  | (127,000) | (2,603,000) |  |  |  |  |
Balancing and Memorandum Account, Refunds (Collections) |  |  |  |  |  |  |  | $ (9,340,000) | 25,108,000 |  |  |  |  |
Regulatory Balancing and Memorandum Accounts Review, Authorized Revenue, Threshold Percentage |  |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
PRVMA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  | $ 1,219,000 |  |  |  |  |  |
Refunds (Collections) Adjustments |  |  |  |  |  |  |  | (111,000) |  |  |  |  |  |
CEMA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  | 2,266,000 |  |  |  |  |  |
Refunds (Collections) Adjustments |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
2018 WCMA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  |  | (9,386,000) |  |  |  |  |
2017 WCMA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  |  | 1,182,000 |  |  |  |  |
2017 WCMA Reserve Recorded |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  |  | 1,169,000 |  |  |  |  |
Cost of capital memorandum accounts |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  | (8,000) | (30,000) | $ (1,379,000) |  |  |  |
Tax memorandum account |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  | (2,000) | (139,000) | $ (6,504,000) |  |  |  |
San Jose Water Company | Application No. 20-04-009 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Rate Filings, Requested Authorization For Debt Issuance, Amount |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |
Regulatory Rate Case Filings, Requested Authorization For Equity Issuance, Amount |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
San Jose Water Company | Cost Of Capital Filings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Rate Filings, Requested Deferment Period |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |
San Jose Water Company | General Rate Case No. 21-01-003 | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested Rate Increase, Year One |  |  |  |  |  |  |  |  |  |  | $ 51,585,000 |  |  |
Requested Rate Increase, Year One, Percentage |  |  |  |  |  |  |  |  |  |  | 13.35% |  |  |
Requested Rate Increase, Year Two |  |  |  |  |  |  |  |  |  |  | $ 16,932,000 |  |  |
Requested Rate Increase, Year Two, Percentage |  |  |  |  |  |  |  |  |  |  | 3.88% |  |  |
Requested Rate Increase, Year Three |  |  |  |  |  |  |  |  |  |  | $ 19,195,000 |  |  |
Requested Rate Increase, Year Three, Percentage |  |  |  |  |  |  |  |  |  |  | 4.24% |  |  |
Balancing And Memorandum Account, Requested Recovery (Refund) |  |  |  |  |  |  |  |  |  |  | $ 18,499,000 |  |  |
Regulatory Rate Filings, Requested Authorization For Capital Budget, Amount |  |  |  |  |  |  |  |  |  |  | $ 435,000,000 |  |  |
San Jose Water Company | Advice Letter No. 532 | 2018 WCMA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  |  | (9,386,000) |  |  |  |  |
San Jose Water Company | Advice Letter No. 532 | 2019 WCMA |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Asset Increase (Decrease) |  |  |  |  |  |  |  |  | (639,000) |  |  |  |  |
San Jose Water Company | Advice Letter No. 528/528A |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Refunds (Collections) Adjustments |  |  |  |  |  |  | $ 27,045,000 |  |  |  |  |  |  |
Balancing And Memorandum Account, Approved Recovery Period |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |
Balancing and Memorandum Account, Refunds (Collections) |  |  |  |  |  |  |  | $ 151,000 | $ 25,108,000 |  |  |  |  |
Balancing And Memorandum Account, Approved Recovery, Surcharge Per Cubic Foot | ft³ |  |  |  |  |  |  | 0.005894 |  |  |  |  |  |  |
San Jose Water Company And Three Other California Water Utilities | Cost Of Capital Filings | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Rate Filings, Requested Deferment Period |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Connecticut Water Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized WICA Surcharge, Percentage |  |  |  |  |  |  |  | 5.75% |  |  |  |  |  |
Requested WICA Surcharge Increase (Decrease), Percentage |  |  |  | 1.11% |  |  |  |  |  |  |  |  | (0.09%) | 2.60%
Requested WICA Surcharge, Percentage |  |  |  | 6.94% |  |  |  |  |  |  |  |  | 5.75% | 5.84%
Regulatory Rate Filings, Requested Rate Increase, Increase In Revenues |  |  |  | $ 956,000 |  |  |  |  |  |  |  |  |  |
Connecticut Water Company | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Rate Filings, Requested Increase In Revenues | $ 20,206,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory Rate Filings, Requested Increase In Revenues, Completed Infrastructure Investments Not Currently In Approved Rates And Surcharges | $ 265,514,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Avon Water Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized WICA Surcharge, Percentage |  |  |  |  |  |  |  | 9.31% |  |  |  |  |  |
Requested WICA Surcharge Increase (Decrease), Percentage |  |  |  |  |  |  |  |  |  |  |  |  | (0.05%) |
Requested WICA Surcharge, Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 9.26% |
Maine Water Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 304,000 |  |  | $ 371,000 |  |  |  |  |  |  |  |
Maine Water Company | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested WISC Surcharge Increase (Decrease), Percentage |  |  | 1.10% |  |  | 1.76% |  |  |  |  |  |  |  |
Maine Water Company | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Requested WISC Surcharge Increase (Decrease), Percentage |  |  | 5.00% |  |  | 3.00% |  |  |  |  |  |  |  |

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