| Component: (Network and Table) | |
|---|---|
| Network | 2422401 - Disclosure - Subsequent Event In Text Tagging (Details) (http://www.ctwater.com/role/SubsequentEventInTextTaggingDetails) |
| Table | Subsequent Event [Table] |
| Reporting Entity [Axis] | 0000276209 (http://www.sec.gov/CIK) |
| Subsequent Event Type [Axis] | Subsequent Event Type [Domain] |
| Financing [Axis] | Financing [Domain] |
| Dividends [Axis] | Dividends [Domain] |
| Sale [Axis] | Sale [Domain] |
| Extraordinary Item [Axis] | Extraordinary Item [Domain] |
| Bankruptcy of Party [Axis] | Bankruptcy [Domain] |
| Loss on Receivables [Axis] | Loss on Receivables [Domain] |
| Product Recall [Axis] | Product Recall [Domain] |
| Litigation Status [Axis] | Litigation Status [Domain] |
| Litigation Case [Axis] | Litigation Case Type [Domain] |
| New Contract [Axis] | New Contract [Domain] |
| Cancellation of Contract [Axis] | Cancellation of Contract [Domain] |
| Impairment in Value of Asset [Axis] | Impairment in Value of Asset [Domain] |
| Expropriation of Assets [Axis] | Expropriation of Assets [Domain] |
| Disposal Group Name [Axis] | Disposal Groups, Including Discontinued Operations, Name [Domain] |
| Change in Tax Status [Axis] | Change in Tax Status [Domain] |
| Subsequent Event [Line Items] | Period [Axis] | |
|---|---|---|
2012-02-03 | 2011-12-31 | |
| Business Acquisition [Axis] | Business Acquisition [Axis] | |
| Hebron Country Manor [Member] | Maine Water Company [Member] | |
Number of customers | 16,000 | |
Business Combination, Consideration Transferred | 100,000 | 35,600,000 |