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Revenue from Contract with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
WRAM under (over)-collection (alternative revenue program) | $ 64,723 | $ 64,412
Revenues | 101,733 | 94,728
GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
WRAM under (over)-collection (alternative revenue program) | 64,723 | 64,412
Water Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 60,325 | 67,010
WRAM under (over)-collection (alternative revenue program) | (4,398) | (2,598)
Revenues | 64,723 | 64,412
Electric Service Utility Operations | GOLDEN STATE WATER COMPANY |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 11,320 | 10,066
BRRAM over-collection (alternative revenue program) | 691 | (234)
Revenues | 10,629 | 9,832
Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 26,381 | 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 | 59,575 | 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 | 11,266 | 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 | 291 | 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 | 54 | 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 | 459 | 442
Water | Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | 13,355 | 13,000
Wastewater | Contracted Services | ASUS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from contract with customer, excluding assessed tax | $ 13,026 | $ 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% | 85.00%

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