Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities			$ (8,622)	$ 86,070
GSWC
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities			(8,683)	81,854
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Plan assets, contributions by employer			2,900
Increase (decrease) in regulatory assets and liabilities	$ 0	$ 27	0	211
Pension Benefits | GSWC
Defined Benefit Plan Disclosure [Line Items]
Regulatory adjustment — deferred	1,500		1,500
Pension Benefits | BVES
Defined Benefit Plan Disclosure [Line Items]
Regulatory adjustment — deferred	600		600
Pension Benefits | Water: | GSWC
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities	$ (100)		$ (400)	$ 200