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Regulatory Matters (Details 7) (GSWC, CPUC Subpoena, USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2011
Audit
Dec. 31, 2013
Dec. 31, 2012
Regulatory matters:      
Total settlement $ 9.5    
Reduction in rate-base and other adjustments as per the settlement 3.0    
Refunds provided to customers   $ 3.1 $ 3.2
Number of separate independent audits of procurement practices agreed as a part of the settlement agreement 3    
Period of separate independent audits of procurement practices agreed as a part of settlement agreement 10 years    
Minimum
      
Regulatory matters:      
Period of refunds to customers 12 months    
Maximum
      
Regulatory matters:      
Period of refunds to customers 36 months