Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net income	$ 4,695us-gaap_NetIncomeLoss	$ 906us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	10,558	9,881
Deferred income taxes	460us-gaap_DeferredIncomeTaxExpenseBenefit	113us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation	399us-gaap_ShareBasedCompensation	244us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Accounts receivable and accrued unbilled utility revenue	(410)us-gaap_IncreaseDecreaseInReceivables	3,282us-gaap_IncreaseDecreaseInReceivables
Accounts payable and other current liabilities	167	(972)
Accrued groundwater extraction charges and purchased water	748	(653)
Purchased power	(51)sjw_IncreaseDecreaseinPurchasedPower	(46)sjw_IncreaseDecreaseinPurchasedPower
Tax receivable and accrued taxes	9,011	1,574
Other current asset and liabilities related to balancing and memorandum accounts	(857)	95
Postretirement benefits	2,289	1,507
Regulatory asset related to balancing and memorandum accounts	561	411
Other changes, net	(2,117)	(412)
NET CASH PROVIDED BY OPERATING ACTIVITIES	27,167	15,740
INVESTING ACTIVITIES:
Company-funded	(16,253)us-gaap_PaymentsToAcquireWaterSystems	(25,158)us-gaap_PaymentsToAcquireWaterSystems
Contributions in aid of construction	(1,847)	(1,625)
Additions to real estate investments	(59)us-gaap_PaymentsToAcquireRealEstate	0us-gaap_PaymentsToAcquireRealEstate
Payments for business/asset acquisition and water rights	(991)	(807)
Cost to retire utility plant, net of salvage	(2,318)	(229)
NET CASH USED IN INVESTING ACTIVITIES	(21,468)	(27,819)
FINANCING ACTIVITIES:
Borrowings from line of credit	16,700us-gaap_ProceedsFromLinesOfCredit	16,800us-gaap_ProceedsFromLinesOfCredit
Repayments of line of credit	(18,200)us-gaap_RepaymentsOfLinesOfCredit	(2,200)us-gaap_RepaymentsOfLinesOfCredit
Repayments of long-term borrowings	(147)us-gaap_RepaymentsOfLongTermDebt	(138)us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(3,966)us-gaap_PaymentsOfDividendsCommonStock	(3,788)us-gaap_PaymentsOfDividendsCommonStock
Exercise of stock options and similar instruments	433	476
Tax benefits realized from share options exercised	526	280
Receipts of advances and contributions in aid of construction	2,416	1,897
Refunds of advances for construction	(443)	(429)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(2,681)	12,898
NET CHANGE IN CASH AND CASH EQUIVALENTS	3,018	819
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,399	2,299
CASH AND CASH EQUIVALENTS, END OF PERIOD	5,417	3,118
Cash paid (received) during the period for:
Interest	6,474us-gaap_InterestPaid	5,066us-gaap_InterestPaid
Income taxes	(6,000)us-gaap_IncomeTaxesPaidNet	(10)us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash activities:
Increase (decrease) in accrued payables for construction costs capitalized	4,408	(1,254)
Utility property installed by developers	$ (35)sjw_UtilityPropertyInstalledByDeveloper	$ 1,277sjw_UtilityPropertyInstalledByDeveloper

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- Definition

The cash outflow for the purchase of a facility and equipment that provides water supply which includes wells, reservoirs, pumping stations, and control facilities.

+ References

+ Details

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- Definition

The cash inflow from developers, builders, governmental agencies and municipalities that provide the entity with cash to extend its construction services to their properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash outflow for the payments made by the entity, generally on a straight-line basis over periods ranging from five to forty years to developers, builders, government agencies and municipalities for borrowings received in construction.

+ References

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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