Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 51,806us-gaap_NetIncomeLoss	$ 22,384us-gaap_NetIncomeLoss	$ 22,318us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	39,491	36,595	34,629
Deferred income taxes	26,067us-gaap_DeferredIncomeTaxExpenseBenefit	11,567us-gaap_DeferredIncomeTaxExpenseBenefit	12,235us-gaap_DeferredIncomeTaxExpenseBenefit
Share-based compensation	1,031us-gaap_ShareBasedCompensation	912us-gaap_ShareBasedCompensation	564us-gaap_ShareBasedCompensation
Gain on sale of real estate investment	(554)us-gaap_GainLossOnSaleOfProperties	(1,063)us-gaap_GainLossOnSaleOfProperties	(910)us-gaap_GainLossOnSaleOfProperties
Gain on sale of California Water Service Group stock	2,017	0	0
Changes in operating assets and liabilities:
Accounts receivable and accrued unbilled utility revenue	(1,276)us-gaap_IncreaseDecreaseInReceivables	(3,073)us-gaap_IncreaseDecreaseInReceivables	(800)us-gaap_IncreaseDecreaseInReceivables
Accounts payable, purchased power and other current liabilities	(449)	(21)	933
Accrued groundwater extraction charges and purchased water	(1,705)	2,361	(1,034)
Tax receivable and accrued taxes	(5,546)	(1,112)	5,093
Other current asset and liabilities related to balancing and memorandum accounts	(16,881)	388	5,740
Postretirement benefits	(325)	127	77
Regulatory asset related to balancing and memorandum accounts	(22,846)	(3,645)	(3,550)
Other noncurrent assets and noncurrent liabilities	(2,001)	(884)	(1,503)
Other changes, net	1,116	(1,111)	575
Net cash provided by operating activities	65,911	63,425	74,367
Investing activities:
Company-funded	(91,846)us-gaap_PaymentsToAcquireWaterSystems	(82,720)us-gaap_PaymentsToAcquireWaterSystems	(101,458)us-gaap_PaymentsToAcquireWaterSystems
Contributions in aid of construction	(10,090)	(11,605)	(4,376)
Additions to real estate investment	(13)us-gaap_PaymentsToAcquireRealEstate	(4,232)us-gaap_PaymentsToAcquireRealEstate	(678)us-gaap_PaymentsToAcquireRealEstate
Payments for business/asset acquisition and water rights	(1,768)	(3,349)	(2,280)
Cost to retire utility plant, net of salvage	(1,551)	(2,695)	(922)
Proceeds from sale of real estate investment	4,572	8,831	5,517
Proceeds from sale of California Water Service Group stock	3,056	0	0
Net cash used in investing activities	(97,640)	(95,770)	(104,197)
Financing activities:
Borrowings from line of credit	57,200us-gaap_ProceedsFromLinesOfCredit	48,600us-gaap_ProceedsFromLinesOfCredit	16,300us-gaap_ProceedsFromLinesOfCredit
Repayments of line of credit	(66,400)us-gaap_RepaymentsOfLinesOfCredit	(41,500)us-gaap_RepaymentsOfLinesOfCredit	(1,000)us-gaap_RepaymentsOfLinesOfCredit
Long-term borrowings	50,000	0	0
Repayments of long-term borrowings	(602)us-gaap_RepaymentsOfLongTermDebt	(5,439)us-gaap_RepaymentsOfLongTermDebt	(3,696)us-gaap_RepaymentsOfLongTermDebt
Debt issuance costs	(528)us-gaap_PaymentsOfDebtIssuanceCosts	(19)us-gaap_PaymentsOfDebtIssuanceCosts	(33)us-gaap_PaymentsOfDebtIssuanceCosts
Dividends paid	(15,177)us-gaap_PaymentsOfDividendsCommonStock	(14,443)us-gaap_PaymentsOfDividendsCommonStock	(13,231)us-gaap_PaymentsOfDividendsCommonStock
Issuance of common stock, net of issuance costs	0	35,894	0
Exercise of stock options and similar instruments	1,917	1,004	989
Tax benefits realized from share options exercised	462	28	97
Receipts of advances and contributions in aid of construction	7,569	10,293	8,407
Refunds of advances for construction	(2,612)	(2,296)	(2,215)
Net cash provided by financing activities	31,829	32,122	5,618
Net change in cash and cash equivalents	100	(223)	(24,212)
Cash and cash equivalents, beginning of year	2,399	2,299	2,522
Cash and cash equivalents, end of year	2,299	2,522	26,734
Cash paid (received) during the year for:
Interest	21,046us-gaap_InterestPaid	20,886us-gaap_InterestPaid	21,206us-gaap_InterestPaid
Income Taxes Paid, Net	6,324us-gaap_IncomeTaxesPaidNet	4,186us-gaap_IncomeTaxesPaidNet	(1,445)us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash activities:
(Decrease) Increase in accrued payables for construction costs capitalized	(4,981)	4,588	355
Utility property installed by developers	$ 6,549sjw_UtilityPropertyInstalledByDeveloper	$ 2,162sjw_UtilityPropertyInstalledByDeveloper	$ 4,073sjw_UtilityPropertyInstalledByDeveloper

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The net cash inflow or outflow from the costs of disposing of plant, whether by demolishing, dismantling, abandoning, sale, and so forth during the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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

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

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The cash inflow from the additional capital contribution to the entity.

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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.

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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.

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The cash inflow associated with the sale of equity securities classified as available-for-sale securities.

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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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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.

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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.

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

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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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