| **Schedule 1 - Condensed Parent Company Financial Statements (Condensed Statements of Comprehensive Income) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands** | 3 Months Ended | 12 Months Ended |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                                     |           |            |   |   |   |   |   |   |   |   |   |   |   |
| Operating income                                                                                                                                                                           | $ 71,962       | $ 97,799        | $ 83,493 | $ 72,331 | $ 74,615 | $ 95,072 | $ 80,246 | $ 71,167 | $ 325,585 | $ 321,100 | $ 314,359 |   |   |
| Interest expense, net                                                                                                                                                                      |           |            |   |   |   |   |   |   | 80,594 | 76,536 | 76,397 |   |   |
| Income (loss) before equity in earnings of subsidiaries and income taxes                                                                                                                   |           |            |   |   |   |   |   |   | 255,160 | 216,752 | 239,103 | $ 224,104 | $ 247,057 |
| Equity in earnings of subsidiaries                                                                                                                                                         |           |            |   |   |   |   |   |   | 976 | (35,177) | (3,989) |   |   |
| Provision for income taxes                                                                                                                                                                 |           |            |   |   |   |   |   |   | 20,978 | 14,962 | 25,219 | 21,233 | 65,220 |
| Net income                                                                                                                                                                                 | $ 49,649       | $ 73,170        | $ 59,626 | $ 51,737 | $ 28,434 | $ 67,429 | $ 57,382 | $ 48,545 | 234,182 | 201,790 | 233,239 | $ 221,300 | $ 196,563 |
| Comprehensive income                                                                                                                                                                       |           |            |   |   |   |   |   |   | $ 234,164 | $ 201,689 | $ 233,681 |   |   |
| Basic                                                                                                                                                                                      | $ 0.28         | $ 0.41          | $ 0.34 | $ 0.29 | $ 0.16 | $ 0.38 | $ 0.32 | $ 0.27 | $ 1.32 | $ 1.14 | $ 1.32 | $ 1.26 | $ 1.13 |
| Diluted                                                                                                                                                                                    | $ 0.28         | $ 0.41          | $ 0.33 | $ 0.29 | $ 0.16 | $ 0.38 | $ 0.32 | $ 0.27 | $ 1.32 | $ 1.14 | $ 1.31 | $ 1.25 | $ 1.12 |
| Basic                                                                                                                                                                                      |           |            |   |   |   |   |   |   | 177,273 | 176,788 | 176,864 |   |   |
| Diluted                                                                                                                                                                                    |           |            |   |   |   |   |   |   | 177,846 | 177,517 | 177,763 |   |   |
| Aqua America, Inc. [Member]                                                                                                                                                                |           |            |   |   |   |   |   |   |   |   |   |   |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                                     |           |            |   |   |   |   |   |   |   |   |   |   |   |
| Other income                                                                                                                                                                               |           |            |   |   |   |   |   |   | $ 3,301 | $ 3,034 | $ 4,228 |   |   |
| Operating expense and other expenses                                                                                                                                                       |           |            |   |   |   |   |   |   | 4,569 | 1,440 | 627 |   |   |
| Operating income                                                                                                                                                                           |           |            |   |   |   |   |   |   | (1,268) | 1,594 | 3,601 |   |   |
| Interest expense, net                                                                                                                                                                      |           |            |   |   |   |   |   |   | 2,901 | 1,833 | 2,160 |   |   |
| Other (income) expense                                                                                                                                                                     |           |            |   |   |   |   |   |   | (87) |   | 443 |   |   |
| Income (loss) before equity in earnings of subsidiaries and income taxes                                                                                                                   |           |            |   |   |   |   |   |   | (4,082) | (239) | 998 |   |   |
| Equity in earnings of subsidiaries                                                                                                                                                         |           |            |   |   |   |   |   |   | 236,309 | 201,003 | 230,209 |   |   |
| Income before income taxes                                                                                                                                                                 |           |            |   |   |   |   |   |   | 232,227 | 200,764 | 231,207 |   |   |
| Provision for income taxes                                                                                                                                                                 |           |            |   |   |   |   |   |   | (1,955) | (1,026) | (2,032) |   |   |
| Net income                                                                                                                                                                                 |           |            |   |   |   |   |   |   | 234,182 | 201,790 | 233,239 |   |   |
| Comprehensive income                                                                                                                                                                       |           |            |   |   |   |   |   |   | $ 234,164 | $ 201,689 | $ 233,681 |   |   |
| Basic                                                                                                                                                                                      |           |            |   |   |   |   |   |   | $ 1.32 | $ 1.14 | $ 1.32 |   |   |
| Diluted                                                                                                                                                                                    |           |            |   |   |   |   |   |   | $ 1.32 | $ 1.14 | $ 1.31 |   |   |
| Basic                                                                                                                                                                                      |           |            |   |   |   |   |   |   | 177,273 | 176,788 | 176,864 |   |   |
| Diluted                                                                                                                                                                                    |           |            |   |   |   |   |   |   | 177,846 | 177,517 | 177,763 |   |   |

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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.
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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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The net result for the period of deducting operating expenses from operating revenues.
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The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.
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Amount of income (expense) related to nonoperating activities, classified as other.
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The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
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