XML 49 R37.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Texas Water Alliance Limited (Details) - USD ($) $ in Thousands | Feb. 22, 2016 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Equity Method Investments and Joint Ventures [Abstract] |  |  |
Proceeds from Sales of Business, Affiliate and Productive Assets | $ 31,000 |  |
Purchase and Sales Agreement, Holdback Amount | 3,000 |  |
Non-refundable deposit | $ 3,000 | $ 3,000 | $ 0

X
- Definition Non-Refundable Escrow Deposit + References No definition available. + Details
Name: | sjw_NonRefundableEscrowDeposit
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase and Sales Agreement, Holdback Amount + References No definition available. + Details
Name: | sjw_PurchaseandSalesAgreementHoldbackAmount
Namespace Prefix: | sjw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate cash proceeds received from a combination of transactions in which noncurrent assets are sold, which may include the sale of a business, an investment in an affiliate (including an equity method investee), property, plant and equipment and intangible assets. Excludes sales of trading, available-for-sale, and held-to-maturity securities. + References No definition available. + Details
Name: | us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration