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Regulatory Rate Filings (Details) - USD ($) |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 14, 2018 | Jul. 31, 2018 | Jul. 26, 2018 | Jun. 13, 2018 | Jun. 07, 2018 | Jan. 01, 2018 | Dec. 31, 2018 | Jan. 04, 2018 | Jun. 06, 2017
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Regulatory Rate Filings, Requested Rate Increase, Year One |  |  |  |  |  |  |  | $ 34,288,000 |
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 |  |  |  |  |  |  |  | $ 14,232,000 |
Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two |  |  |  |  |  |  |  | 3.70% |
Regulatory Rate Filings, Requested Rate Increase, Year Three |  |  |  |  |  |  |  | $ 20,582,000 |
Regulatory Rate Filings, Requested Rate Increase, Percent of Authorized Revenue, Year Three |  |  |  |  |  |  |  | 5.17% |
Memorandum Account, Authorized Recovery |  |  |  |  |  |  |  | $ 20,725,000 |
Public Utilities, Requested Rate Increase (Decrease), Amount |  |  | $ 3,155,000 | $ 13,732,000 | $ (14,801,000) |  |  |  |
Public Utilities, Requested Rate Increase (Decrease), Percentage |  |  | 0.83% | 3.75% | (3.89%) |  |  |  |
CPED Calculated Double-Billing Refund | $ 4,935,000 |  |  |  |  |  |  |  |
SJWTX, Inc. |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Authorized Regulatory Surcharge, Per Thousand Gallons |  | $ 1.13 |  |  |  | $ 1.15 |  |  |
Scenario, Forecast | SJWTX, Inc. |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Public Utilities, Approved Rate Decrease, Amount |  |  |  |  |  |  | $ 1,023,000 |  |
Minimum |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
CPED Proposed Penalty, Per Offense, Per Day | 500 |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
CPED Proposed Penalty, Per Offense, Per Day | 50,000 |  |  |  |  |  |  |  |
Cal PA Complaint 17-06-009 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
Requested Service Charge Refund |  |  |  |  |  |  |  |  | $ 1,794,000
CPED Calculated Refund 2014-2016 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
CPED Calculated Service Charge Refund | 2,061,000 |  |  |  |  |  |  |  |
CPED Calculated Refund 1987-2013 |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |
CPED Calculated Service Charge Refund | $ 1,990,000 |  |  |  |  |  |  |  |

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