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Regulatory Rate Filings (Details) (USD $) | 0 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 29, 2014 | Sep. 30, 2014 | Aug. 14, 2014 | Oct. 03, 2013
Regulated Operations [Abstract] |  |  |  |
Water reduction target goal (percent) |  | 20.00% |  |
Authorized rate increase, authorized revenue, year one |  |  | $ 22,102,000 |
Authorized rate increase, authorized revenue, year one (percent) |  |  | 9.81% |
Authorized rate increase, authorized revenue, year two |  |  | 13,274,000 |
Authorized rate increase, authorized revenue, year two (percent) |  |  | 5.21% |
Authorized Regulatory Surcharge, Gross | 46,700,000 |  |  |
Customer surcharge, recognition period | 3 years |  |  |
Authorized Regulatory Surcharge, Per CCF | 0.2888 |  |  |
Increase requested percent of authorized revenue (percent) |  |  |  | 23.10%
Requested rate increase, authorized revenue |  |  |  | $ 2,400,000

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- Definition Authorized Regulatory Surcharge, Gross + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Authorized Regulatory Surcharge, Per CCF + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Customer Surcharge, Recognition Period + References No definition available. + Details
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Namespace Prefix: | sjw_
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Balance Type: | na
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- Definition Regulatory Rate Filings, Authorized Rate Increase, Authorized Revenue, Year One + References No definition available. + Details
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- Definition Regulatory Rate Filings, Authorized Rate Increase, Authorized Revenue, Year Two + References No definition available. + Details
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- Definition Regulatory Rate Filings, Authorized Rate Increase, Percent of Authorized Revenue, Year One + References No definition available. + Details
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- Definition Regulatory Rate Filings, Authorized Rate Increase as Percentage of Total Revenue at Time of Request, Year Two + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Regulatory Rate Filings, Total Increase Requested, Percentage + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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- Definition Regulatory Rate Filings, Requested Rate Increase, Authorized Revenue + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
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- Definition Water Reduction Target Goal, Percentage + References No definition available. + Details
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- Details
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