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Regulatory Rate Filings (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 | May. 29, 2015 | Apr. 23, 2015 | Mar. 26, 2015 | Jan. 05, 2015
Regulatory Liabilities [Line Items] |  |  |  |  |
Authorized Regulatory Surcharge, Gross | $ 1,937 |  |  |  |
Regulatory Rate Filings, Requested Rate Increase, Year One |  |  |  |  | $ 34,928
Regulatory Rate Filings, Requested Rate Increase as Percentage of Total Revenue at Time of Request, Year One |  |  |  |  | 12.22%
Regulatory Rate Filings, Requested Rate Increase, Year Two |  |  |  |  | $ 9,954
Regulatory Rate Filings, Proposed Rate Increase, Percent of Authorized Revenue, Year Two |  |  |  |  | 3.11%
Regulatory Rate Filings, Requested Rate Increase, Year Three |  |  |  |  | $ 17,567
Regulatory Rate Filings, Requested Rate Increase, Percent of Authorized Revenue, Year Three |  |  |  |  | 5.36%
Balancing Account, Recovery Request |  |  |  |  | $ 4,752
Memorandum Account, Recovery Request |  |  |  | $ 9,567 | $ 976
Regulatory Rate Filings, Recommended Rate Increase, Year One |  |  | $ 23,468 |  |
Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year One |  |  | 8.54% |  |
Regulatory Rate Filings, Recommended Rate Increase, Year Two |  |  | $ 13,803 |  |
Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year Two |  |  | 4.42% |  |
Regulatory Rate Filings, Recommended Rate Increase, Year Three |  |  | $ 16,261 |  |
Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year Three |  |  | 4.95% |  |
Regulatory Rate Filings, Requested Rate Increase, Authorized Revenue |  | $ 18,357 |  |  |
Regulatory Rate Filings, Increase Requested, Percent of Authorized Revenue |  | 6.44% |  |  |

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- 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

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- 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

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- Definition Regulatory Rate Filings, Total Increase Requested, Percentage + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | num:percentItemType
Balance Type: | na
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, Recommended Rate Increase, Year One + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRecommendedRateIncreaseYearOne
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Regulatory Rate Filings, Recommended Rate Increase, Year Three + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRecommendedRateIncreaseYearThree
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Regulatory Rate Filings, Recommended Rate Increase, Year Two + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRecommendedRateIncreaseYearTwo
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year One + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRecommendedRateIncreaseasPercentageofTotalRevenueatTimeofRequestYearOne
Namespace Prefix: | sjw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Regulatory Rate Filings, Recommended Rate Increase as Percentage of Total Revenue at Time of Request, Year Three + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Regulatory Rate Filings, Recommended 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
Period Type: | instant

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- Definition Regulatory Rate Filings, Requested Rate Increase, Authorized Revenue + References No definition available. + Details
Name: | sjw_RegulatoryRateFilingsRequestedRateIncreaseAuthorizedRevenue
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
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- Definition Regulatory Rate Filings, Requested Rate Increase, Year One + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
- 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

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- 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
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