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Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 108,570	$ 117,060
GSWC
Disaggregation of Revenue [Line Items]
Total operating revenues	73,906	75,029
Water Service Utility Operations | GSWC
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	73,565	75,339
Total operating revenues	73,906	75,029
Electric Service Utility Operations | BVESI
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	12,579	11,879
Total operating revenues	11,892	11,539
Contracted Services | ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	22,772	30,492
Tariff-based Revenues | Water Service Utility Operations | GSWC
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	72,498	74,288
Tariff-based Revenues | Electric Service Utility Operations | BVESI
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	12,552	11,677
Surcharges (Cost-recovery Activities) | Water Service Utility Operations | GSWC
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	549	534
Surcharges (Cost-recovery Activities) | Electric Service Utility Operations | BVESI
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	27	202
Other Products and Services | Water Service Utility Operations | GSWC
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	518	517
Alternative revenues program [Member] | Water Service Utility Operations | GSWC
Disaggregation of Revenue [Line Items]
Alternative revenue program	(341)	310
Alternative revenues program [Member] | Electric Service Utility Operations | BVESI
Disaggregation of Revenue [Line Items]
Alternative revenue program	687	340
Water | Contracted Services | ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	13,546	18,883
Wastewater | Contracted Services | ASUS
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 9,226	$ 11,609

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