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Regulatory Rate Filings (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 26, 2018 | Jun. 13, 2018 | Jun. 07, 2018 | Dec. 31, 2018 | Jan. 04, 2018
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Regulatory Rate Filings, Requested Rate Increase, Year One |  |  |  |  | $ 34,288
Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year One |  |  |  |  | 9.76%
Regulatory Rate Filings, Requested Rate Increase, Year Two |  |  |  |  | $ 14,232
Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two |  |  |  |  | 3.70%
Regulatory Rate Filings, Requested Rate Increase, Year Three |  |  |  |  | $ 20,582
Regulatory Rate Filings, Requested Rate Increase, Percent of Authorized Revenue, Year Three |  |  |  |  | 5.17%
Memorandum Account, Authorized Recovery |  |  |  |  | $ 20,725
Public Utilities, Requested Rate Increase (Decrease), Amount |  | $ 13,732 | $ (14,801) |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  | 3.75% | (3.89%) |  |
Subsequent Event [Member] |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 3,155 |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage | 0.83% |  |  |  |
Scenario, Forecast [Member] | SJWTX, Inc. [Member] |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Public Utilities, Approved Rate Decrease, Amount |  |  |  | $ 1,023 |

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