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Capitalization | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
CAPITALIZATION | Capitalization SJW Group is authorized to issue 36,000,000 shares of common stock of $0.001 par value per share. At December 31, 2017 and 2016, 20,520,856 and 20,456,225, respectively, shares of common stock were issued and outstanding. At December 31, 2017 and 2016, 1,000,000 shares of preferred stock of $0.001 par value per share were authorized for SJW Group. At December 31, 2017 and 2016, no shares of preferred stock were issued or outstanding.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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