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General - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Apr. 01, 2015	Mar. 31, 2015	Dec. 31, 2015	Jan. 05, 2015
Regulatory Liabilities [Line Items]
Water reduction target goal (percent)		20.00%	30.00%
Mandatory Water Reduction, Percentage	25.00%
Memorandum Account, Recovery Request				$ 976

X

- Definition

Mandatory Water Reduction, Percentage

+ References

No definition available.

+ Details

Name:	sjw_MandatoryWaterReductionPercentage
Namespace Prefix:	sjw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

Water Reduction Target Goal, Percentage

+ References

No definition available.

+ Details

Name:	sjw_WaterReductionTargetGoalPercentage
Namespace Prefix:	sjw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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