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Lines of Credit Narrative (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 standy_letter_of_credit | Dec. 31, 2013
Unsecured Debt [Member] | Wells Fargo [Member] | SJW Corp. [Member] |  |
Ratio of indebtedness to total capital | 0.666sjw_RatioOfIndebtednessToCapital / us-gaap_CreditFacilityAxis = us-gaap_UnsecuredDebtMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LineOfCreditFacilityAxis = sjw_LenderMember |
Debt covenant interest charge maximum to net Income available to stockholders | 1.75sjw_DebtCovenantInterestChargeMaximumtoNetIncomeAvailabletoStockholders / us-gaap_CreditFacilityAxis = us-gaap_UnsecuredDebtMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LineOfCreditFacilityAxis = sjw_LenderMember |
Revolving Credit Facility [Member] |  |
Aggregate amount of unsecured revolving credit facility | $ 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Revolving Credit Facility [Member] | SJW Corp. [Member] |  |
Aggregate outstanding balance on lines of credit | 13,200,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22,400,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Line of Credit Facility, Interest Rate at Period End | 1.15%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.29%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Revolving Credit Facility [Member] | Wells Fargo [Member] | SJW Corp., SJW Land Company [Member] |  |
Aggregate amount of unsecured revolving credit facility | 15,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = sjw_ParentCompanyAndSubsidiaryMember / us-gaap_LineOfCreditFacilityAxis = sjw_LenderMember |
Revolving Credit Facility [Member] | Wells Fargo [Member] | San Jose Water Company [Member] |  |
Aggregate amount of unsecured revolving credit facility | 85,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LineOfCreditFacilityAxis = sjw_LenderMember | 75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LineOfCreditFacilityAxis = sjw_LenderMember
Standby Letters of Credit [Member] | San Jose Water Company [Member] |  |
Aggregate amount of unsecured revolving credit facility | $ 3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_StandbyLettersOfCreditMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Number of standby letters of credit | 2sjw_LineOfCreditFacilityNumberOfStandbyLettersOfCredit / us-gaap_CreditFacilityAxis = us-gaap_StandbyLettersOfCreditMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Automatic renewal term of standby letters of credit | 1 year |

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- Definition Debt, Covenant, Interest Charge Maximum to Net Income Available to Stockholders + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition Line of Credit Facility, Number of Standby Letters of Credit + References No definition available. + Details
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Namespace Prefix: | sjw_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition Line of Credit Facility, Standby Letter Of Credit, Automatic Renewal Term + References No definition available. + Details
Name: | sjw_LineOfCreditFacilityStandbyLetterOfCreditAutomaticRenewalTerm
Namespace Prefix: | sjw_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Ratio of Indebtedness to Total Capital + References No definition available. + Details
Name: | sjw_RatioOfIndebtednessToCapital
Namespace Prefix: | sjw_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Balance Type: | na
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |