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Long-Term Debt Long-term Debt Schedule (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Long-term debt | $ 384,949us-gaap_LongTermDebt | $ 335,551us-gaap_LongTermDebt
Less: Current portion | 584us-gaap_LongTermDebtCurrent | 554us-gaap_LongTermDebtCurrent
Total long-term debt, less current portion | 384,365us-gaap_LongTermDebtNoncurrent | 334,997us-gaap_LongTermDebtNoncurrent
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 315,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 265,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Mortgages [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rates | 5.61%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Mortgages [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rates | 6.09%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Mortgages [Member] | Mortgage loans due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 3,109us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_MortgageTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 3,215us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_MortgageTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Mortgages [Member] | Mortgage loans due 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 11,896us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_MortgageThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 12,142us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_MortgageThreeMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Mortgages [Member] | 444 West Santa Clara Street, L.P. [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 2,947us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_MortgageFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember | 3,053us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_MortgageFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember
Stated interest rates | 5.68%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_MortgageFourMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series A [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 20,000us-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 B [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 30,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesBMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 30,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesBMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 7.37%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_SeriesBMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series C [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 10,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesCMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 10,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesCMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 9.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesCMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series D [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 15,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesDMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 15,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesDMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 7.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesDMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series E [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 15,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesEMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 15,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesEMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 6.81%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesEMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series F [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesFMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesFMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 7.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesFMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series G [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesGMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesGMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 5.93%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesGMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series H [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesHMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesHMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 5.71%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesHMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series I [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesIMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesIMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 5.93%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesIMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series J [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 10,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesJMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 10,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesJMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 6.54%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesJMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series K [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesKMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 20,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_SeriesKMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Stated interest rates | 6.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_SeriesKMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |
San Jose Water Company [Member] | Senior Notes [Member] | Series L [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 50,000us-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 |
San Jose Water Company [Member] | Bonds [Member] | California Pollution Control Financing Authority Revenue Bonds [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 50,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_CaliforniaPollutionControlFinancingAuthorityRevenueBondsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_PublicUtilityBondsMember | 50,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = sjw_CaliforniaPollutionControlFinancingAuthorityRevenueBondsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_PublicUtilityBondsMember
Stated interest rates | 5.10%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = sjw_CaliforniaPollutionControlFinancingAuthorityRevenueBondsMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_PublicUtilityBondsMember |
San Jose Water Company [Member] | SDWSRF loans [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,997us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember | 2,141us-gaap_LongTermDebt / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
San Jose Water Company [Member] | SDWSRF loans [Member] | Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rates | 2.39%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
San Jose Water Company [Member] | SDWSRF loans [Member] | Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Stated interest rates | 2.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 2.60%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember / us-gaap_RangeAxis = us-gaap_MaximumMember
SJWTX,Inc. dba Canyon Lake Water Supply Corporation [Member] | Senior Notes [Member] | Series A [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 15,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = sjw_SubsidiaryOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 15,000us-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 |
SJW Corp. [Member] | Senior Notes [Member] | Series A [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeriesAMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | $ 50,000us-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 |

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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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