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Organization, Summary of Significant Accounting Policies and Recent Developments (Schedule of Depreciation Rates) (Details)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Source of Supply [Member] | Minimum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 1.15% 1.15% 1.15%
Source of Supply [Member] | Maximum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 3.44% 3.44% 3.44%
Pumping [Member] | Minimum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.87% 2.87% 2.87%
Pumping [Member] | Maximum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 5.39% 5.39% 5.39%
Water Treatment [Member] | Minimum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 1.65% 1.65% 1.65%
Water Treatment [Member] | Maximum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 7.09% 7.09% 7.09%
General Plant [Member] | Minimum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.08% 2.08% 2.08%
General Plant [Member] | Maximum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 17.84% 17.84% 17.84%
T&D Mains [Member] | Minimum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 1.10% 1.10% 1.10%
T&D Mains [Member] | Maximum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 3.13% 3.13% 3.13%
T&D Services [Member] | Minimum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 2.12% 2.12% 2.12%
T&D Services [Member] | Maximum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 3.16% 3.16% 3.16%
T&D Other [Member] | Minimum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 1.61% 1.61% 1.61%
T&D Other [Member] | Maximum [Member]      
Public Utility, Property, Plant and Equipment [Line Items]      
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service 4.63% 4.63% 4.63%