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Regulatory Rate Filings (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Mar. 27, 2015	Mar. 26, 2015	Jan. 05, 2015
Regulatory Liabilities [Line Items]
Authorized Regulatory Surcharge, Gross	$ 1,876sjw_AuthorizedRegulatorySurchargeGross
Regulatory Rate Filings, Requested Rate Increase, Year One			34,928sjw_RegulatoryRateFilingsRequestedRateIncreaseYearOne
Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year One			12.22%sjw_RegulatoryRateFilingsRequestedRateIncreaseasPercentageofTotalRevenueatTimeofRequestYearOne
Regulatory Rate Filings, Requested Rate Increase, Year Two			9,954sjw_RegulatoryRateFilingsRequestedRateIncreaseYearTwo
Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two			3.11%sjw_RegulatoryRateFilingsProposedRateIncreasePercentofAuthorizedRevenueYearTwo
Regulatory Rate Filings, Requested Rate Increase, Year Three			17,567sjw_RegulatoryRateFilingsRequestedRateIncreaseYearThree
Regulatory Rate Filings, Requested Rate Increase, Percent of Authorized Revenue, Year Three			5.36%sjw_RegulatoryRateFilingsRequestedRateIncreasePercentOfAuthorizedRevenueYearThree
Balancing Account, Recovery Request			4,752sjw_BalancingAccountRecoveryRequest
Memorandum Account, Recovery Request		$ 9,567sjw_MemorandumAccountRecoveryRequest	$ 976sjw_MemorandumAccountRecoveryRequest

X

- Definition

Authorized Regulatory Surcharge, Gross

+ References

No definition available.

+ Details

Name:	sjw_AuthorizedRegulatorySurchargeGross
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A request to the regulatory authority for authorization to recover under (over) -collected amounts.

+ References

No definition available.

+ Details

Name:	sjw_BalancingAccountRecoveryRequest
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A request to the regulatory authority for authorization to refund over (under) collected amounts.

+ References

No definition available.

+ Details

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

X

- Definition

Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two

+ References

No definition available.

+ Details

Name:	sjw_RegulatoryRateFilingsProposedRateIncreasePercentofAuthorizedRevenueYearTwo
Namespace Prefix:	sjw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year One

+ References

No definition available.

+ Details

Name:	sjw_RegulatoryRateFilingsRequestedRateIncreaseasPercentageofTotalRevenueatTimeofRequestYearOne
Namespace Prefix:	sjw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year Three

+ References

No definition available.

+ Details

Name:	sjw_RegulatoryRateFilingsRequestedRateIncreasePercentOfAuthorizedRevenueYearThree
Namespace Prefix:	sjw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Regulatory Rate Filings, Requested Rate Increase, Year One

+ References

No definition available.

+ Details

Name:	sjw_RegulatoryRateFilingsRequestedRateIncreaseYearOne
Namespace Prefix:	sjw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Regulatory Rate Filings, Requested Rate Increase, Year Three

+ References

No definition available.

+ Details

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

X

- Definition

Regulatory Rate Filings, Requested Rate Increase, Year Two

+ References

No definition available.

+ Details

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

X

- Details

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