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Revenue from Contract with Customer - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue, Water | $ 76,733 | $ 80,734 | $ 141,145 | $ 147,138
Revenues | 106,901 |  | 201,629 |
Golden State Water Company [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue, Water | 76,733 | $ 80,734 | 141,145 | $ 147,138
Golden State Water Company [Member] | Water Service Utility Operations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue, Water | (5,301) |  | (2,703) |
Revenues | 76,733 |  | 141,145 |
Golden State Water Company [Member] | Electric Service Utility Operations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Regulated Operating Revenue, Electric, Non-Nuclear | 17 |  | 251 |
Revenues | 7,841 |  | 17,673 |
American States Utility Services [Member] | Contracted Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 22,327 |  | 42,811 |
American States Utility Services [Member] | Contracted Services [Member] | Water [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 14,233 |  | 27,233 |
American States Utility Services [Member] | Contracted Services [Member] | Wastewater [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 8,094 |  | 15,578 |
Billed Revenues [Member] | Golden State Water Company [Member] | Water Service Utility Operations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 71,432 |  | 138,442 |
Billed Revenues [Member] | Golden State Water Company [Member] | Water Service Utility Operations [Member] | Tariff-based Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 70,251 |  | 136,026 |
Billed Revenues [Member] | Golden State Water Company [Member] | Water Service Utility Operations [Member] | Surcharges (Cost-recovery Activities) [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 728 |  | 1,521 |
Billed Revenues [Member] | Golden State Water Company [Member] | Water Service Utility Operations [Member] | Other Products and Services [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 453 |  | 895 |
Billed Revenues [Member] | Golden State Water Company [Member] | Electric Service Utility Operations [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,858 |  | 17,924 |
Billed Revenues [Member] | Golden State Water Company [Member] | Electric Service Utility Operations [Member] | Tariff-based Revenues [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,795 |  | 17,814 |
Billed Revenues [Member] | Golden State Water Company [Member] | Electric Service Utility Operations [Member] | Surcharges (Cost-recovery Activities) [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 63 |  | $ 110 |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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