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Revenues Contract assets and Contract Liabilities (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) unit | Dec. 31, 2022 USD ($)
Contract with Customer, Asset and Liability [Line Items] |  |
Revenue, Remaining Performance Obligation, Amount | $ 4,000,000 |
American States Utility Services |  |
Contract with Customer, Asset and Liability [Line Items] |  |
Unbilled Contracts Receivable | 9,693 | $ 10,125
Government Contract Receivable | 91,489 | 85,456
Contract assets | 14,378 | 14,982
Contract liabilities | $ 1,352 | $ 903
Minimum | American States Utility Services |  |
Contract with Customer, Asset and Liability [Line Items] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 15 years |
Maximum | American States Utility Services |  |
Contract with Customer, Asset and Liability [Line Items] |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 50 years |
Contracted services: | American States Utility Services |  |
Contract with Customer, Asset and Liability [Line Items] |  |
Number of the contracts with 15-year contracts with the U.S. government | unit | 1 |
Contracted services: | Minimum | American States Utility Services |  |
Contract with Customer, Asset and Liability [Line Items] |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 15 years |
Contracted services: | Maximum |  |
Contract with Customer, Asset and Liability [Line Items] |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |
Contracted services: | Maximum | American States Utility Services |  |
Contract with Customer, Asset and Liability [Line Items] |  |
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases | 50 years |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 + Details
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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479837/606-10-45-2 + Details
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