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Revenue from Contract with Customer - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |
WRAM over-collection | $ 64,412 | $ 66,404
Revenues | 94,728 |
GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
WRAM over-collection | 64,412 | $ 66,404
Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 67,010 |
WRAM over-collection | 2,598 |
Revenues | 64,412 |
Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 10,066 |
BRRAM over-collection | 234 |
Revenues | 9,832 |
Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 20,484 |
Tariff-based Revenues | Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 65,775 |
Tariff-based Revenues | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 10,019 |
Surcharges (Cost-recovery Activities) | Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 793 |
Surcharges (Cost-recovery Activities) | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 47 |
Other Products and Services | Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 442 |
Water | Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 13,000 |
Wastewater | Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | $ 7,484 |
Sales | Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Concentration Risk, Percentage | 90.00% | 90.00%
Sales | Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Concentration Risk, Percentage | 85.00% |

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