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Revenue from Contract with Customer - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 124,182 | $ 124,418 | $ 325,811 | $ 336,423
WRAM under-collection (alternative revenue program) | 87,689 | 91,919 | 228,834 | 239,057
Golden State Water Company |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 95,564 | 99,913 | 254,382 | 265,165
WRAM under-collection (alternative revenue program) | 87,689 | $ 91,919 | 228,834 | $ 239,057
Golden State Water Company | Water Service Utility Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 87,689 |  | 228,834 |
WRAM under-collection (alternative revenue program) | 938 |  | (1,765) |
Golden State Water Company | Electric Service Utility Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,875 |  | 25,548 |
BRRAM over-collection (alternative revenue program) | 394 |  | 645 |
American States Utility Services | Contracted Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contracted services | 28,618 |  | 71,429 |
American States Utility Services | Contracted Services | Water |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contracted services | 16,909 |  | 44,134 |
American States Utility Services | Contracted Services | Wastewater |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Contracted services | 11,709 |  | 27,295 |
Billed Revenues | Golden State Water Company | Water Service Utility Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 88,627 |  | 227,069 |
Billed Revenues | Golden State Water Company | Water Service Utility Operations | Tariff-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 87,204 |  | 223,230 |
Billed Revenues | Golden State Water Company | Water Service Utility Operations | CPUC-approved surcharges (cost-recovery activities) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 937 |  | 2,458 |
Billed Revenues | Golden State Water Company | Water Service Utility Operations | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 486 |  | 1,381 |
Billed Revenues | Golden State Water Company | Electric Service Utility Operations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,269 |  | 26,193 |
Billed Revenues | Golden State Water Company | Electric Service Utility Operations | Tariff-based revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,207 |  | 26,021 |
Billed Revenues | Golden State Water Company | Electric Service Utility Operations | CPUC-approved surcharges (cost-recovery activities) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 62 |  | $ 172 |

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