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Long-Term Debt Narrative (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Long-term debt | $ 384,949,000us-gaap_LongTermDebt | $ 335,551,000us-gaap_LongTermDebt
Significant Observable Inputs (Level 2) |  |
Fair value of long-term debt | 460,171,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 395,684,000us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Senior Notes [Member] |  |
Long-term debt | 315,000,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 265,000,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
San Jose Water Company [Member] | Senior Notes [Member] |  |
Ratio of indebtedness to total capital | 0.6666sjw_RatioOfIndebtednessToCapital / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges | 1.75sjw_RatioOfIncomeToInterestCharges / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series A [Member] |  |
Long-term debt | 20,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 20,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 8.58%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series L [Member] |  |
Long-term debt | 50,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesLMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesLMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 5.14%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesLMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Senior Notes [Member] | Series A [Member] |  |
Long-term debt | 15,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = sjw_SubsidiaryOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 15,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = sjw_SubsidiaryOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 6.27%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = sjw_SubsidiaryOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Ratio of indebtedness to total capital | 0.6666sjw_RatioOfIndebtednessToCapital / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = sjw_SubsidiaryOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Ratio of net income available for interest charges for the trailing 12-month calendar period to interest charges | 1.75sjw_RatioOfIncomeToInterestCharges / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = sjw_SubsidiaryOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
SJW Corp. [Member] | Senior Notes [Member] | Series A [Member] |  |
Long-term debt | 50,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 50,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 4.35%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Ratio of indebtedness to total capital | 0.6666sjw_RatioOfIndebtednessToCapital / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Minimum net worth required for compliance | 175,000,000us-gaap_MinimumNetWorthRequiredForCompliance / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
Cumulative net income, percentage included in net worth for compliance | 30.00%sjw_CumulativeNetIncomePercentageIncludedInNetWorthForCompliance / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
SJW Corp. [Member] | Senior Notes [Member] | Series A [Member] | Financial Guarantee [Member] |  |
Ratio of indebtedness to total capital | 0.6666sjw_RatioOfIndebtednessToCapital / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
SJW Corp. [Member] | Senior Notes [Member] | Series A [Member] | Financial Guarantee [Member] | Minimum [Member] |  |
Minimum net worth required for compliance | $ 125,000,000us-gaap_MinimumNetWorthRequiredForCompliance / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Cumulative net income, percentage included in net worth for compliance | 30.00%sjw_CumulativeNetIncomePercentageIncludedInNetWorthForCompliance / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: 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
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