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Long-Term Debt (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016	Dec. 31, 2014 USD ($)
GSWC
Long-term debt
Ratio of Indebtedness to Net Capital	0.4332
Ratio of Indebtedness to EBITDA	2.5
GSWC | Maximum
Long-term debt
Ratio of Indebtedness to Net Capital	0.6667
Ratio of Indebtedness to EBITDA	8
Private Placement Notes [Member] | GSWC
Long-term debt
Interest coverage ratio	400.00%
Private Placement Notes [Member] | GSWC | Minimum
Long-term debt
Interest coverage ratio	200.00%
Private placement notes
Long-term debt
Interest rate (as a percent)	9.56%	9.56%
Private placement notes | GSWC
Long-term debt
Debt Instrument, Face Amount	$ 28,000,000
Interest rate (as a percent)	9.56%	9.56%
Debt Instrument Redemption Premium above Treasury Yield	5500.00%
Private placement notes | GSWC | Maximum
Long-term debt
Redemption premium after 2021 (as a percent)	3.00%
Private placement notes | American States Utility Services [Member]
Long-term debt
Interest rate (as a percent)	9.56%
Notes Payable 5.87 Percent Due 2028 [Member]
Long-term debt
Interest rate (as a percent)	5.87%	5.87%
Notes Payable 5.87 Percent Due 2028 [Member] | GSWC
Long-term debt
Interest rate (as a percent)	5.87%	5.87%
Notes Payable 5.87 Percent Due 2028 [Member] | American States Utility Services [Member]
Long-term debt
Interest rate (as a percent)	5.87%
Notes Payable 6.7 Percent Due 2019 [Member]
Long-term debt
Interest rate (as a percent)	6.70%	6.70%
Notes Payable 6.7 Percent Due 2019 [Member] | GSWC
Long-term debt
Interest rate (as a percent)	6.70%	6.70%
Notes Payable 6.7 Percent Due 2019 [Member] | American States Utility Services [Member]
Long-term debt
Interest rate (as a percent)	6.70%
Senior Notes issued to Co-Bank | GSWC
Long-term debt
Additional spread on premium (as a percent)	0.50%
American Recovery and Reinvestment Act Obligation due 2033 | GSWC
Long-term debt
Interest rate (as a percent)	2.50%
Notes Payable 3.45 Percent Due 2029 [Member]
Long-term debt
Interest rate (as a percent)	3.45%	3.45%
Notes Payable 3.45 Percent Due 2029 [Member] | GSWC
Long-term debt
Debt Instrument, Face Amount	$ 15,000,000		$ 15,000,000
Interest rate (as a percent)	3.45%	3.45%	3.45%

X

- Definition

Represents the additional spread on premium based on the difference between cost of funds on the date of purchase and the date of redemption, expressed as a percentage.

+ References

No definition available.

+ Details

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- Definition

Represents the interest coverage ratio required to be maintained for debt instrument.

+ References

No definition available.

+ Details

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- Definition

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+ References

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- Definition

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+ References

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- Definition

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+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt 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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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- Definition

Indebtedness divided by net capital.

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