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Revenues Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) unit	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Prerequisites for Billing, Long-term Contracts									P5Y
BRRAM over-collection (alternative revenue program)									$ (39,548)	$ (34,350)	$ (33,969)
Operating revenues	$ 112,993	$ 134,496	$ 124,647	$ 101,733	$ 111,005	$ 124,182	$ 106,901	$ 94,728	473,869	436,816	440,603
GSWC
Disaggregation of Revenue [Line Items]
BRRAM over-collection (alternative revenue program)									(39,548)	(34,350)	(33,969)
Operating revenues	$ 81,233	$ 107,245	$ 95,548	$ 75,352	$ 75,226	$ 95,564	$ 84,574	$ 74,244	359,378	329,608	340,301
GSWC | Water:
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									311,572	303,593
Regulated Operating Revenue									8,258	(8,335)
Operating revenues									319,830	295,258	306,332
GSWC | Water: | Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									305,244	298,818
GSWC | Water: | CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									4,322	2,962
GSWC | Water: | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									2,006	1,813
GSWC | Electric:
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									37,038	34,715
BRRAM over-collection (alternative revenue program)									2,510	(365)
Operating revenues									39,548	34,350	33,969
GSWC | Electric: | Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									36,628	34,501
GSWC | Electric: | CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									$ 410	214
American States Utility Services [Member] | Contracted services:
Disaggregation of Revenue [Line Items]
Period of Fixed Price Contracts to Operate and Maintain Water Systems at Various Military Bases									50 years
Revenue from contract with customers									$ 114,491	107,208
Operating revenues									$ 114,491	107,208	$ 100,302
Number of construction performance obligation | unit									1
American States Utility Services [Member] | Contracted services: | Water
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									$ 59,868	62,273
American States Utility Services [Member] | Contracted services: | Wastewater
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									$ 54,623	$ 44,935

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