| **Schedule 1 - Condensed Parent Company Financial Statements (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands** | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 |
|------------------------------------------------------------------------------------------------------------------------------|---------------|---------------|---------------|---------------|---------------|
| **Condensed Balance Sheet Statements, Captions [Line Items]**                                                                |          |          |          |          |          |
| Accounts receivable, net                                                                                                     | $ 97,394      | $ 99,146      |          |          |          |
| Prepayments and other current assets                                                                                         | 12,804        | 11,802        |          |          |          |
| Total current assets                                                                                                         | 128,650       | 128,370       |          |          |          |
| Deferred charges and other assets, net                                                                                       | 30,845        | 28,878        |          |          |          |
| Investment in subsidiaries                                                                                                   | 7,026         | 7,716         |          |          |          |
| Total assets                                                                                                                 | 6,158,991     | 5,717,873     | $ 5,383,243   | $ 5,027,430   | $ 4,834,165   |
| Stockholders' equity                                                                                                         | 1,850,068     | 1,725,930     | $ 1,655,343   | $ 1,534,835   | $ 1,385,704   |
| Long-term debt, excluding current portion, net of debt issuance costs                                                        | 1,737,605     | 1,720,447     |          |          |          |
| Current portion of long-term debt                                                                                            | 150,671       | 35,593        |          |          |          |
| Accounts payable                                                                                                             | 59,872        | 56,452        |          |          |          |
| Accrued interest                                                                                                             | 18,367        | 12,651        |          |          |          |
| Accrued taxes                                                                                                                | 25,607        | 21,887        |          |          |          |
| Other accrued liabilities                                                                                                    | 40,484        | 49,895        |          |          |          |
| Total current liabilities                                                                                                    | 301,536       | 193,199       |          |          |          |
| Other liabilities                                                                                                            | 115,583       | 100,498       |          |          |          |
| Total liabilities and equity                                                                                                 | 6,158,991     | 5,717,873     |          |          |          |
| Aqua America, Inc. [Member]                                                                                                  |          |          |          |          |          |
| **Condensed Balance Sheet Statements, Captions [Line Items]**                                                                |          |          |          |          |          |
| Accounts receivable, net                                                                                                     | 441           | 382           |          |          |          |
| Accounts receivable - affiliates                                                                                             | 60,264        | 28,423        |          |          |          |
| Income tax receivable                                                                                                        |          | 219           |          |          |          |
| Prepayments and other current assets                                                                                         | 3,782         | 3,545         |          |          |          |
| Total current assets                                                                                                         | 64,487        | 32,569        |          |          |          |
| Deferred charges and other assets, net                                                                                       | 22,231        | 21,313        |          |          |          |
| Notes receivable - affiliates                                                                                                | 345,149       | 331,604       |          |          |          |
| Accounts receivable - affiliates                                                                                             | 109,340       | 103,891       |          |          |          |
| Deferred income tax asset                                                                                                    | 67,508        | 85,089        |          |          |          |
| Investment in subsidiaries                                                                                                   | 1,920,055     | 1,745,634     |          |          |          |
| Total assets                                                                                                                 | 2,528,770     | 2,320,100     |          |          |          |
| Stockholders' equity                                                                                                         | 1,850,068     | 1,725,927     |          |          |          |
| Long-term debt, excluding current portion, net of debt issuance costs                                                        | 483,817       | 420,350       |          |          |          |
| Current portion of long-term debt                                                                                            | 26,050        | 16,050        |          |          |          |
| Accrued interest                                                                                                             | 3,469         | 2,495         |          |          |          |
| Accounts payable - affiliates                                                                                                | 23,582        | 21,465        |          |          |          |
| Other accrued liabilities                                                                                                    | 10,707        | 16,169        |          |          |          |
| Total current liabilities                                                                                                    | 63,808        | 56,179        |          |          |          |
| Other liabilities                                                                                                            | 131,077       | 117,644       |          |          |          |
| Total liabilities and equity                                                                                                 | $ 2,528,770   | $ 2,320,100   |          |          |          |

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.
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| - Definition
Amount of receivables arising from transactions with related parties due within one year or the normal operating cycle, if longer.
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Amount of receivables arising from transactions with related parties, due after 1 year (or 1 business cycle).
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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.
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| - Definition
Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.
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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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Amount of deferred cost assets and assets classified as other.
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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences and carryforwards, classified as noncurrent.
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| - Definition
Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.
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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.
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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.
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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.
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| - Definition
Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 1 year (or 1 business cycle).
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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.
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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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