Revenues - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 item
ASUS
Disaggregation of Revenue [Line Items]
Number of contracts with 15 year contract	1
ASUS | Minimum
Disaggregation of Revenue [Line Items]
Period of fixed price contracts to operate and maintain water systems at various military bases	15 years
ASUS | Maximum
Disaggregation of Revenue [Line Items]
Period of fixed price contracts to operate and maintain water systems at various military bases	50 years
Golden State Water Company and Bear Valley Electric Service Inc. | Sales | Customer Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	90.00%
Contracted services: | Bay State Utility Service LLC (" BSUS")
Disaggregation of Revenue [Line Items]
Period of fixed price contracts to operate and maintain water systems at various military bases	15 years