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Lines of Credit Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 29, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) standy_letter_of_credit | Dec. 31, 2014 USD ($) | Jun. 01, 2016 USD ($)
Repayments of Long-term Debt |  | $ 16,599,000 | $ 633,000 | $ 602,000 |
SDWSRF Loans [Member] | San Jose Water Company [Member] |  |  |  |  |
Repayments of Long-term Debt | $ 1,823,000 |  |  |  |
Revolving Credit Facility [Member] | SJW Group [Member] |  |  |  |  |
Aggregate outstanding balance on lines of credit |  | $ 14,200,000 | $ 34,600,000 |  |
Revolving Credit Facility [Member] | Wells Fargo Bank, National Association [Member] | San Jose Water Company [Member] |  |  |  |  |
Standby letters of credit |  |  |  |  | $ 3,060,000
Unsecured Debt [Member] | Chase Bank, N.A. [Member] | SJW Group [Member] |  |  |  |  |
Debt covenant interest charge maximum to net Income available to stockholders |  | 1.75 |  |  |
Ratio of indebtedness to total capital |  | 0.666 |  |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | SJW Group [Member] |  |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 1.48% | 1.31% |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Chase Bank, N.A. [Member] | SJW Corp. and SJW Land Company [Member] |  |  |  |  |
Standby letters of credit |  |  |  |  | 15,000,000
Line of Credit [Member] | Revolving Credit Facility [Member] | Wells Fargo Bank, National Association [Member] | San Jose Water Company [Member] |  |  |  |  |
Standby letters of credit |  |  | $ 85,000,000 |  |
Line of Credit [Member] | Revolving Credit Facility [Member] | Wells Fargo Bank, National Association [Member] | SJW Group [Member] |  |  |  |  |
Standby letters of credit |  |  | $ 100,000,000 |  |
Line of Credit [Member] | Standby Letters of Credit [Member] | San Jose Water Company [Member] |  |  |  |  |
Standby letters of credit |  | $ 3,000,000 |  |  |
Number of standby letters of credit | standy_letter_of_credit |  |  | 2 |  |
Line of Credit [Member] | Credit Agreement [Member] | Chase Bank, N.A. [Member] | San Jose Water Company [Member] |  |  |  |  |
Standby letters of credit |  |  |  |  | 125,000,000
Line of Credit [Member] | Credit Agreement [Member] | Standby Letters of Credit [Member] | Chase Bank, N.A. [Member] | San Jose Water Company [Member] |  |  |  |  |
Standby letters of credit |  |  |  |  | 10,000,000
Line of Credit [Member] | SJW Corp Credit Agreement [Member] | Revolving Credit Facility [Member] | Wells Fargo Bank, National Association [Member] | SJW Corp. and SJW Land Company [Member] |  |  |  |  |
Standby letters of credit |  |  | $ 15,000,000 |  |
Line of Credit [Member] | SJW Corp Credit Agreement [Member] | Standby Letters of Credit [Member] | Chase Bank, N.A. [Member] | SJW Corp. and SJW Land Company [Member] |  |  |  |  |
Standby letters of credit |  |  |  |  | 5,000,000
Line of Credit [Member] | SJWTX Credit Agreement [Member] | Revolving Credit Facility [Member] | Chase Bank, N.A. [Member] | SJW Corp. and SJWTX, Inc. [Member] |  |  |  |  |
Standby letters of credit |  |  |  |  | 5,000,000
Line of Credit [Member] | SJWTX Credit Agreement [Member] | Standby Letters of Credit [Member] | Chase Bank, N.A. [Member] | SJW Corp. and SJWTX, Inc. [Member] |  |  |  |  |
Standby letters of credit |  |  |  |  | $ 1,000,000

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- Definition Debt, Covenant, Interest Charge Maximum to Net Income Available to Stockholders + References No definition available. + Details
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- Definition Line of Credit Facility, Number of Standby Letters of Credit + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: 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 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 + Details
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- Definition The effective interest rate at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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