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Commitments (Details) $ / billions_gallons in Thousands, $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 19, 2023 gal | Jun. 16, 2022 | Nov. 07, 2020 $ / ft³ gal | Nov. 06, 2020 | May 19, 2003 | Mar. 31, 2023 | Dec. 31, 2023 USD ($) employee acre_foot $ / billions_gallons $ / ft³ gal | Dec. 31, 2022 USD ($) gal | Dec. 31, 2021 USD ($) gal | Dec. 31, 2008 gal | Dec. 31, 1997 USD ($) | Feb. 25, 2022 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchased water |  |  |  |  |  |  | $ 135,982 | $ 122,334 | $ 98,231 |  |  |
Contract agreement, incremental up-front payment |  |  |  |  |  |  |  |  |  |  | $ 5,000 |
Intangible assets |  |  |  |  |  |  | $ 35,946 | 35,959 |  |  |  |
Union Member |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Collective bargaining agreement percent of wage increase for 2023 |  |  |  |  |  | 6.00% |  |  |  |  |  |
Collective bargaining agreement percent of wage increase for 2024 |  |  |  |  |  | 3.50% |  |  |  |  |  |
Collective bargaining agreement percent of wage increase for 2025 |  |  |  |  |  | 5.50% |  |  |  |  |  |
SJW Group |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  |  |  | 387 |  |  |  |  |
SJW Group | Union Member |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  |  |  | 240 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  |  |  |  | 70 years |  |  |  |  |
RWA | Capacity Agreement |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current contract water rate (in USD per million of gallons) | $ / billions_gallons |  |  |  |  |  |  | 3,100 |  |  |  |  |
RWA | Maximum | Capacity Agreement |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Agreement to purchase water (in gallons of water) | gal |  |  |  |  |  |  |  |  |  | 1,000,000 |  |
MDC | Capacity Agreement |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Current contract water rate (in USD per million of gallons) | $ / ft³ |  |  |  |  |  |  | 3.80 |  |  |  |  |
Purchase commitment period |  |  |  |  | 50 years |  |  |  |  |  |  |
Agreement to purchase water (in gallons of water) | gal | 280,000,000 |  |  |  |  |  |  |  |  |  |  |
Kennebec Water District |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Agreement to purchase water (in gallons of water) | gal |  |  | 50,000,000.00 |  |  |  |  |  |  |  |  |
Long-term purchase commitment, wholesale discount (in USD per hundred cubic feet) | $ / ft³ |  |  | 0.20 |  |  |  |  |  |  |  |  |
Contract agreement, term |  |  | 20 years | 20 years |  |  |  |  |  |  |  |
Tariff rate (in USD per hundred cubic feet) | $ / ft³ |  |  |  |  |  |  | 1.51 |  |  |  |  |
International Union of Operating Engineers | SJW Group |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Bargaining agreements, term |  |  |  |  |  | 3 years |  |  |  |  |  |
Service Agreements |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  |  |  |  |  |  |  |  | 25 years |
Intangible assets |  |  |  |  |  |  | $ 4,292 |  |  |  |  |
Concession fees |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 6,800 | $ 6,800 |  |  | $ 6,800 | $ 1,600
Lease renewal term |  |  |  |  |  |  |  |  |  |  |  | 2 years
Santa Clara Valley Water District |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Master contract, negotiated term for delivery schedules |  |  |  |  |  |  | 3 years |  |  |  |  |
Water purchased (in millions of gallons) | gal |  |  |  |  |  |  | 18,300,000,000 | 18,200,000,000 | 19,400,000,000 |  |  |
Purchased water |  |  |  |  |  |  | $ 111,173 | $ 96,793 | $ 91,938 |  |  |
Reduction in delivery schedule, percent |  | 23.00% |  |  |  |  |  |  |  |  |  |
Minimum percent of delivery schedule to be purchased |  |  |  |  |  |  | 90.00% |  |  |  |  |
Minimum volume of water to be purchased (in million gallons) | gal |  |  |  |  |  |  | 18,900,000,000 |  |  |  |  |
Cost of water to be purchased |  |  |  |  |  |  | $ 121,182 |  |  |  |  |
Current contract water rate (in USD per million of gallons) | $ / billions_gallons |  |  |  |  |  |  | 6,411 |  |  |  |  |
Guadalupe-Blanco River Authority | SJWTX, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term purchase commitment, minimum area required (in acre-feet of water) | acre_foot |  |  |  |  |  |  | 7,650 |  |  |  |  |
Notice period required for contract adjustment |  |  |  |  |  |  | 60 days |  |  |  |  |
Lower Colorado River Authority | SJWTX, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term purchase commitment, minimum area required (in acre-feet of water) | acre_foot |  |  |  |  |  |  | 350 |  |  |  |  |

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