cm:Concept: us-gaap:PaymentsToAcquireWaterAndWasteWaterSystems
| Payments to Acquire Water and Waste Water Systems |
| us-gaap:PaymentsToAcquireWaterAndWasteWaterSystems |
| The cash outflow for the purchase of a facility and equipment that provides water supply which includes wells, reservoirs, pumping stations, and control facilities; and waste water systems which includes the waste treatment and disposal facility and equipment to households and industry. |
| cm:Concept |
| Monetary (xbrli:monetaryItemType) |
| For Period (duration) |
| Credit |
| false |
| us-gaap:PaymentsToAcquireWaterAndWasteWaterSystems |