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Organization, Summary of Significant Accounting Policies and Recent Developments (Details) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Source of Supply | Minimum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 1.15% | 1.15% | 1.15%
Source of Supply | Maximum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 3.44% | 3.44% | 3.44%
Pumping | Minimum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 2.87% | 2.87% | 2.87%
Pumping | Maximum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 5.39% | 5.39% | 5.39%
Water Treatment | Minimum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 1.65% | 1.65% | 1.65%
Water Treatment | Maximum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 7.09% | 7.09% | 7.09%
General Plant | Minimum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 2.08% | 2.08% | 2.08%
General Plant | Maximum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 17.84% | 17.84% | 17.84%
T&D - Mains | Minimum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 1.10% | 1.10% | 1.10%
T&D - Mains | Maximum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 3.13% | 3.13% | 3.13%
T&D - Services | Minimum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 2.12% | 2.12% | 2.12%
T&D - Services | Maximum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 3.16% | 3.16% | 3.16%
T&D - Other | Minimum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 1.61% | 1.61% | 1.61%
T&D - Other | Maximum |  |  |
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service | 4.63% | 4.63% | 4.63%

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- Definition Composite depreciation rate for public utility plants in service. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration