Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) - Audit	1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2014
Regulatory matters:
Separate independent audits	3
Number of Years of Separate Independent Audits of Procurement Practices Agreed under Settlement Agreement	10 years
GOLDEN STATE WATER COMPANY
Regulatory matters:
Period of Separate Independent Audits of Procurement Practices Covered by Report		20 years