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Short-term and Long-term Borrowings (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 0 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 29, 2011
Sep. 30, 2014
Minimum
Sep. 30, 2014
Maximum
Sep. 30, 2014
LIBOR
Sep. 30, 2014
LIBOR
Minimum
Sep. 30, 2014
LIBOR
Maximum
Jun. 29, 2011
California Water Service Group
Jun. 29, 2011
Cal Water
Short-term and Long-term Borrowings                      
Maximum borrowing capacity       $ 400           $ 100 $ 300
Period within which borrowings are to be repaid                     12 months
Basis of interest rate             LIBOR        
Interest rate margin (as a percent)               0.725% 0.95%    
Commitment fee (as a percent)         0.08% 0.125%          
Amount outstanding under line of credit $ 61.7 $ 46.8                  
Average borrowing rate (as a percent) 1.16%   2.20%