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Real Estate Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Schedule of Investments [Line Items]
Land	$ 14,168		$ 14,168		$ 14,168
Buildings and improvements	43,917		43,917		43,531
Subtotal	58,085		58,085		57,699
Less accumulated depreciation and amortization	14,493		14,493		13,597
Total	43,592		43,592		$ 44,102
Proceeds from sale of real estate held-for-investment				$ 745
Gain on sale of real estate investments	$ 1,050	$ 0	$ 1,050	745
Restricted Cash		$ 750		750
Minimum
Schedule of Investments [Line Items]
Estimated useful life			7 years
Maximum
Schedule of Investments [Line Items]
Estimated useful life			39 years
San Jose Water Company [Member]
Schedule of Investments [Line Items]
Proceeds from sale of real estate held-for-investment			$ 1,075
Gain on sale of real estate investments			1,048
Real Estate Selling Expenses			$ 22
Parent [Member]
Schedule of Investments [Line Items]
Gain on sale of real estate investments				521
Noncontrolling Interest [Member]
Schedule of Investments [Line Items]
Gain on sale of real estate investments				$ 224
SJW Land Company [Member] | Partnership Interest [Member]
Schedule of Investments [Line Items]
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest			70.00%

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- Definition

Real Estate Selling Expenses

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cumulative amount of depreciation for real estate property held for investment purposes.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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