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Revenues Disaggregation of Revenue (Details) $ in Thousands	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) unit	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Electric										$ 37,024	$ 39,548	$ 34,350
Operating revenues	$ 124,200	$ 133,688	$ 121,278	$ 109,077	$ 112,993	$ 134,496	$ 124,647	$ 101,733		488,243	473,869	436,816
GSWC
Disaggregation of Revenue [Line Items]
Electric										18,647	39,548	34,350
Operating revenues	$ 73,438	$ 98,701	$ 94,753	$ 82,392	$ 81,233	$ 107,245	$ 95,548	$ 75,352		349,284	359,378	329,608
GSWC | Water:
Disaggregation of Revenue [Line Items]
Revenue from contract with customers										335,506	311,572	303,593
Operating revenues										330,637	319,830	295,258
GSWC | Water: | Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customers										329,670	305,244	298,818
GSWC | Water: | CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenue from contract with customers										3,736	4,322	2,962
GSWC | Water: | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customers										2,100	2,006	1,813
GSWC | Water: | Alternative revenue program
Disaggregation of Revenue [Line Items]
Regulated Operating Revenue										$ (4,869)	(8,258)	(8,335)
GSWC | Electric:
Disaggregation of Revenue [Line Items]
Revenue from contract with customers											37,038
Electric									$ 21,510		2,510
Operating revenues											39,548	34,350
GSWC | Electric: | Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customers											36,628
GSWC | Electric: | CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenue from contract with customers											410
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										$ 120,582	114,491	107,208
Operating revenues										$ 120,582	114,491	107,208
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										$ 74,898	59,868	62,273
American States Utility Services [Member] | Contracted services: | Wastewater
Disaggregation of Revenue [Line Items]
Revenue from contract with customers										45,684	$ 54,623	44,935
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric:
Disaggregation of Revenue [Line Items]
Revenue from contract with customers										35,969		34,715
Electric										1,055		365
Operating revenues										37,024		34,350
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric: | Tariff-based revenues
Disaggregation of Revenue [Line Items]
Revenue from contract with customers										35,283		34,501
Golden State Water Company and Bear Valley Electric Service, Inc. [Member] | Electric: | CPUC-approved surcharges (cost-recovery activities)
Disaggregation of Revenue [Line Items]
Revenue from contract with customers										$ 686		$ 214

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