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General - Schedule of SJW Group's Revenue Components (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounting Policies [Abstract]
Revenue from contracts with customers	$ 216,677	$ 211,716	$ 539,790	$ 507,276
Alternative revenue programs, net	7,369	957	6,847	(2,638)
Other balancing and memorandum accounts and regulatory mechanisms, net	(1,432)	(9,260)	(1,019)	(9,906)
Rental income	2,449	1,430	5,001	4,293
Operating revenue	$ 225,063	$ 204,843	$ 550,619	$ 499,025

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