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Long-Term Liabilities and Bank Borrowings (Details) - USD ($) |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 29, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 01, 2016 | May 31, 2016 | Dec. 31, 2015 | Mar. 01, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt |  | $ 5,143,000 | $ 435,000 |  |  |  |
San Jose Water Company [Member] | Chase Bank, N.A. [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 10,000,000 |  |  |
San Jose Water Company [Member] | Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 125,000,000 |  |  |
San Jose Water Company [Member] | Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 3,060,000 | $ 85,000,000 |  |
San Jose Water Company [Member] | SDWSRF Loans [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt | $ 1,823,000 |  |  |  |  |  |
San Jose Water Company [Member] | Chase Bank and Wells Fargo Bank [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 125,000,000 |  |  |  |  |
SJW Corp. and SJW Land Company [Member] | Chase Bank, N.A. [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 5,000,000 |  |  |
SJW Corp. and SJW Land Company [Member] | Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 15,000,000 |  |  |
SJW Corp. and SJW Land Company [Member] | Wells Fargo Bank, National Association [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 15,000,000
SJW Corp. and SJWTX, Inc. [Member] | Chase Bank, N.A. [Member] | Standby Letters of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 1,000,000 |  |  |
SJW Corp. and SJWTX, Inc. [Member] | Chase Bank, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 5,000,000 |  |  |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unamortized Debt Issuance Expense |  | $ 3,561,000 |  |  |  | $ 3,638,000 |

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