Employee Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities				$ (30,312)	$ (8,622)
GSWC
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities				(30,785)	(8,683)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Plan assets, contributions by employer	$ 3,400
Pension Benefits | GSWC
Defined Benefit Plan Disclosure [Line Items]
Regulatory adjustment — deferred	$ 1,700	$ 1,700		1,700
Pension Benefits | Water: | GSWC
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) in regulatory assets and liabilities		$ (400)	$ (100)	$ (1,200)	$ (400)