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Commitments (Details) $ / yr in Thousands, $ in Thousands |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 01, 2022 | Jun. 24, 2021 | Nov. 07, 2020 | Nov. 06, 2020 | Feb. 20, 2020 | May 19, 2003 | Dec. 31, 2021 USD ($) employee acre_foot $ / ft³ $ / million_gallons gal | Dec. 31, 2020 USD ($) gal | Dec. 31, 2019 USD ($) gal | Dec. 31, 2008 $ / yr gal | Dec. 31, 1997 | Nov. 02, 2021 | Jan. 08, 2020 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased water |  |  |  |  |  |  | $ 98,231 | $ 100,723 | $ 99,118 |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 36,276 | 35,167 |  |  |  |  |
Collective bargaining agreement percent of wage increase for 2020 |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
Collective bargaining agreement percent of wage increase for 2021 |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
Collective bargaining agreement percent of wage increase for 2022 |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
SJW Group |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  |  |  | 362 |  |  |  |  |  |
SJW Group | Union Member |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees | employee |  |  |  |  |  |  | 226 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life of intangible assets |  |  |  |  |  |  | 5 years |  |  |  |  |  |
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) |  |  |  |  |  |  | 2,600 |  |  | 75 |  |  |
Purchase commitment period |  |  |  |  |  |  |  |  |  | 14 years |  |  |
RWA | Capacity Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitment period |  |  |  |  |  |  |  |  |  | 50 years |  |  |
RWA | Capacity Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | 4.05 |  |  |  |  |  |
Purchase commitment period |  |  |  |  |  | 50 years |  |  |  |  |  |  |
Agreement to purchase water (in gallons of water) | gal |  |  |  |  |  |  | 283,000,000 |  |  |  |  |  |
Kennebec Water District |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement to purchase water (in gallons of water) | gal |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |
Contract agreement, term |  |  | 20 years | 20 years |  |  |  |  |  |  |  |  |
Long-term purchase commitment, wholesale discount (in USD per hundred cubic feet) | $ / ft³ |  |  |  |  |  |  | 0.20 |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 4,290 |  |  |  |  |  |
Concession fees |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 6,800 | $ 6,800 |  |  |  |  | $ 5,000
Lease Term, Option One |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease renewal term |  |  |  |  |  |  |  |  |  |  |  | 6 months |
Lease Term, Option One | Concession fees |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 350
Lease Term, Option Two |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease renewal term |  |  |  |  |  |  |  |  |  |  |  | 2 years |
Lease Term, Option Two | Concession fees |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | 1,600
Lease Term, Option Three |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease renewal term |  |  |  |  |  |  |  |  |  |  |  | 3 years |
Lease Term, Option Three | Concession fees |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500
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 |  |  |  |  |  |  | 19,365,000,000 | 21,269,000,000 | 21,862,000,000 |  |  |  |
Purchased water |  |  |  |  |  |  | $ 91,938 | $ 96,212 | $ 96,285 |  |  |  |
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 |  |  |  |  |  |  | 18,756,000,000 |  |  |  |  |  |
Cost of water to be purchased |  |  |  |  |  |  | $ 92,902 |  |  |  |  |  |
Current contract water rate (in USD per million of gallons) | $ / million_gallons |  |  |  |  |  |  | 5,000.0 |  |  |  |  |  |
Santa Clara Valley Water District | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in delivery schedule, percent | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Guadalupe-Blanco River Authority | SJWTX, Inc. dba Canyon Lake Water Supply Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
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. dba Canyon Lake Water Supply Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term purchase commitment, minimum area required (in acre-feet of water) | acre_foot |  |  |  |  |  |  | 250 |  |  |  |  |  |

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