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Utility Plant and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Utility plant utilized in continuing operations by major asset class      
Total $ 1,395,959 $ 1,314,283  
Less - accumulated depreciation (471,665) (442,316)  
Construction work in progress 57,183 45,824  
Net utility plant 981,477 917,791 896,500
Water
      
Utility plant utilized in continuing operations by major asset class      
Total 1,316,599 1,236,630  
Water | Land
      
Utility plant utilized in continuing operations by major asset class      
Total 15,423 15,357  
Water | Intangible assets
      
Utility plant utilized in continuing operations by major asset class      
Total 34,019 33,750  
Water | Source of water supply
      
Utility plant utilized in continuing operations by major asset class      
Total 75,651 72,020  
Water | Pumping
      
Utility plant utilized in continuing operations by major asset class      
Total 147,390 142,586  
Water | Water treatment
      
Utility plant utilized in continuing operations by major asset class      
Total 70,947 63,738  
Water | Transmission and distribution
      
Utility plant utilized in continuing operations by major asset class      
Total 856,823 796,973  
Water | General
      
Utility plant utilized in continuing operations by major asset class      
Total 116,346 112,206  
Electric
      
Utility plant utilized in continuing operations by major asset class      
Total 79,360 77,653  
Electric | Intangible assets
      
Utility plant utilized in continuing operations by major asset class      
Total 1,200 1,200  
Electric | Transmission and distribution
      
Utility plant utilized in continuing operations by major asset class      
Total 58,400 56,757  
Electric | Generation
      
Utility plant utilized in continuing operations by major asset class      
Total 12,547 12,547  
Electric | General
      
Utility plant utilized in continuing operations by major asset class      
Total 8,413 [1] 8,349 [1]  
GSWC
      
Utility plant utilized in continuing operations by major asset class      
Total 1,386,869 1,305,366  
Less - accumulated depreciation (466,329) (437,949)  
Construction work in progress 56,754 45,720  
Net utility plant 977,294 913,137  
GSWC | Water
      
Utility plant utilized in continuing operations by major asset class      
Total 1,307,509 1,227,713  
Net utility plant 936,386 871,756 852,264
GSWC | Water | Land
      
Utility plant utilized in continuing operations by major asset class      
Total 15,423 15,357  
GSWC | Water | Intangible assets
      
Utility plant utilized in continuing operations by major asset class      
Total 34,001 33,731  
GSWC | Water | Source of water supply
      
Utility plant utilized in continuing operations by major asset class      
Total 75,651 72,020  
GSWC | Water | Pumping
      
Utility plant utilized in continuing operations by major asset class      
Total 147,390 142,586  
GSWC | Water | Water treatment
      
Utility plant utilized in continuing operations by major asset class      
Total 70,947 63,738  
GSWC | Water | Transmission and distribution
      
Utility plant utilized in continuing operations by major asset class      
Total 856,823 796,973  
GSWC | Water | General
      
Utility plant utilized in continuing operations by major asset class      
Total 107,274 103,308  
GSWC | Electric
      
Utility plant utilized in continuing operations by major asset class      
Total 79,360 77,653  
Net utility plant 40,908 41,381 39,681
GSWC | Electric | Transmission and distribution
      
Utility plant utilized in continuing operations by major asset class      
Total 58,400 56,757  
GSWC | Electric | Generation
      
Utility plant utilized in continuing operations by major asset class      
Total 12,547 12,547  
GSWC | Electric | General
      
Utility plant utilized in continuing operations by major asset class      
Total $ 8,413 [1] $ 8,349 [1]  
[1] Includes intangible assets of $1.2 million for studies performed in association with the electricity segment of the Registrant’s operations for the years ended December 31, 2013 and 2012.