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Regulatory Matters (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Regulatory matters:
Other Liabilities, Current	$ 10,209	$ 18,760
GSWC
Regulatory matters:
Under (over) collection	132,696	125,704
Other Liabilities, Current	9,921	18,659
Other Regulatory Assets Net [Member] | GSWC
Regulatory matters:
Under (over) collection	21,954	23,259
Low income rate assistance balancing accounts | GSWC
Regulatory matters:
Under (over) collection	8,699	9,109
Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC
Regulatory matters:
Regulatory Assets	19,800
Under (over) collection	21,996	$ 43,426
Two-way pension balancing account | Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC
Regulatory matters:
Regulatory Assets	2,200
Two-way pension balancing account | Purchase, production, distribution and sale of water | Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC
Regulatory matters:
Regulatory Assets	2,500
Two-way pension balancing account | Electric | Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC
Regulatory matters:
Regulatory Assets	$ 319

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- Definition

The net amount of all regulatory assets less all regulatory liabilities as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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+ 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 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6904-107765

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
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