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Regulatory Matters: CPUC Rehearing Matter and Procurement Audits (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2011
Audit
Mar. 31, 2013
Jul. 31, 2011
GSWC
La Serena Plant Improvement Project
CPUC Rehearing Matter
Regulatory matters:      
Costs included in rehearing matter     $ 3.5
Disallowed costs and related refunds   $ 2.6  
Separate independent audits 3    
Separate independent audits, period of years after settlement date 10 years