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Subsequent Event (Details) - Subsequent Event [Member] $ in Thousands	Feb. 22, 2016 USD ($)
Subsequent Event [Line Items]
Sales Price of Equity Investment	$ 31,000
Purchase and Sales Agreement, Holdback Amount	$ 3,000
Purchase and Sales Agreement, Holdback Term	4 years

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- Definition

Purchase and Sales Agreement, Holdback Amount

+ References

No definition available.

+ Details

Name:	sjw_PurchaseandSalesAgreementHoldbackAmount
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Purchase and Sales Agreement, Holdback Term

+ References

No definition available.

+ Details

Name:	sjw_PurchaseandSalesAgreementHoldbackTerm
Namespace Prefix:	sjw_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities.

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No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: