Commitments and Contingencies In Text Linking (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Loss Contingencies [Line Items]
Board Approved Capital Budget in Next Fiscal Year	$ 31.3
The Connecticut Water Company [Member]
Loss Contingencies [Line Items]
Allowed Rate of Return on Equity	9.80%
Allowed Return on Rate Base	7.32%
Maine Water Company [Member]
Loss Contingencies [Line Items]
Allowed Rate of Return on Equity	10.00%
Allowed Return on Rate Base	8.31%
Biddeford & Saco Water Company [Member]
Loss Contingencies [Line Items]
Allowed Rate of Return on Equity	10.00%