| **Business Segments (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended                                                                                                                                                                               |
|---------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Segment Reporting Information [Line Items]**                                  |                                                                                                                                                                                         |  |   |  |
| Number of reportable segments                                                   | 3us-gaap_NumberOfReportableSegments                                                                                                                                                          |  |   |  |
| **Segment Reporting Information [Abstract]**                                    |                                                                                                                                                                                         |  |   |  |
| Revenues from external customers                                                | $ 607,271us-gaap_RegulatedAndUnregulatedOperatingRevenue                                                                                                                                     | [1] | $ 657,733us-gaap_RegulatedAndUnregulatedOperatingRevenue | [1] |
| Margin                                                                          | 270,070us-gaap_GrossProfit                                                                                                                                                                   |  | 261,512us-gaap_GrossProfit |  |
| Operations and maintenance expenses                                             | 66,219pny_SegmentReportingInformationOperationsAndMaintenanceExpenses                                                                                                                        |  | 60,668pny_SegmentReportingInformationOperationsAndMaintenanceExpenses |  |
| Income from equity method investments                                           | 8,265us-gaap_IncomeLossFromEquityMethodInvestments                                                                                                                                           |  | 9,941us-gaap_IncomeLossFromEquityMethodInvestments |  |
| Operating income (loss) before income taxes                                     | 161,878pny_SegmentOperatingIncomeLossBeforeIncomeTaxes                                                                                                                                       |  | 162,012pny_SegmentOperatingIncomeLossBeforeIncomeTaxes |  |
| Income before income taxes for reportable segments                              | 152,514us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest                                                                                   |  | 161,102us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  |
| **Segment Reporting Information, Operating Income (Loss) [Abstract]**           |                                                                                                                                                                                         |  |   |  |
| Utility income taxes                                                            | (56,272)pny_OperatingIncomeTaxExpenseBenefit                                                                                                                                                 |  | (59,802)pny_OperatingIncomeTaxExpenseBenefit |  |
| Operating income                                                                | 105,758us-gaap_OperatingIncomeLoss                                                                                                                                                           |  | 102,319us-gaap_OperatingIncomeLoss |  |
| **Segment Reporting Information, Profit (Loss) [Abstract]**                     |                                                                                                                                                                                         |  |   |  |
| Income before income taxes for reportable segments                              | 152,514us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest                                                                                   |  | 161,102us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  |
| Income taxes                                                                    | (59,536)us-gaap_IncomeTaxExpenseBenefit                                                                                                                                                      |  | (63,530)us-gaap_IncomeTaxExpenseBenefit |  |
| Net Income                                                                      | 92,978us-gaap_NetIncomeLoss                                                                                                                                                                  |  | 97,572us-gaap_NetIncomeLoss |  |
| Regulated Operation [Member]                                                    |                                                                                                                                                                                         |  |   |  |
| **Segment Reporting Information [Abstract]**                                    |                                                                                                                                                                                         |  |   |  |
| Revenues from external customers                                                | 607,271us-gaap_RegulatedAndUnregulatedOperatingRevenue/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember                                                              |  | 657,733us-gaap_RegulatedAndUnregulatedOperatingRevenue/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember |  |
| Margin                                                                          | 270,070us-gaap_GrossProfit/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember                                                                                          |  | 261,512us-gaap_GrossProfit/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember |  |
| Operations and maintenance expenses                                             | 66,150pny_SegmentReportingInformationOperationsAndMaintenanceExpenses/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember                                               |  | 60,639pny_SegmentReportingInformationOperationsAndMaintenanceExpenses/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember |  |
| Income from equity method investments                                           | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember                                                                      |  | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember |  |
| Operating income (loss) before income taxes                                     | 162,030pny_SegmentOperatingIncomeLossBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember                                                              |  | 162,121pny_SegmentOperatingIncomeLossBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember |  |
| Income before income taxes for reportable segments                              | 144,401us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember          |  | 151,269us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember |  |
| **Segment Reporting Information, Profit (Loss) [Abstract]**                     |                                                                                                                                                                                         |  |   |  |
| Income before income taxes for reportable segments                              | 144,401us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember          |  | 151,269us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= us-gaap_RegulatedOperationMember |  |
| Non Utility Regulated Activities [Member]                                       |                                                                                                                                                                                         |  |   |  |
| **Segment Reporting Information [Abstract]**                                    |                                                                                                                                                                                         |  |   |  |
| Revenues from external customers                                                | 0us-gaap_RegulatedAndUnregulatedOperatingRevenue/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember                                                             |  | 0us-gaap_RegulatedAndUnregulatedOperatingRevenue/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember |  |
| Margin                                                                          | 0us-gaap_GrossProfit/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember                                                                                         |  | 0us-gaap_GrossProfit/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember |  |
| Operations and maintenance expenses                                             | 31pny_SegmentReportingInformationOperationsAndMaintenanceExpenses/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember                                            |  | 6pny_SegmentReportingInformationOperationsAndMaintenanceExpenses/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember |  |
| Income from equity method investments                                           | 3,771us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember                                                           |  | 3,107us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember |  |
| Operating income (loss) before income taxes                                     | (31)pny_SegmentOperatingIncomeLossBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember                                                          |  | (7)pny_SegmentOperatingIncomeLossBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember |  |
| Income before income taxes for reportable segments                              | 3,740us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember     |  | 3,101us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember |  |
| **Segment Reporting Information, Operating Income (Loss) [Abstract]**           |                                                                                                                                                                                         |  |   |  |
| Segment Operating Income Before Income Taxes                                    | 31pny_SegmentOperatingIncomeBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember                                                                |  | 7pny_SegmentOperatingIncomeBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember |  |
| **Segment Reporting Information, Profit (Loss) [Abstract]**                     |                                                                                                                                                                                         |  |   |  |
| Income before income taxes for reportable segments                              | 3,740us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember     |  | 3,101us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityRegulatedActivitiesMember |  |
| Non Utility Unregulated Activities [Member]                                     |                                                                                                                                                                                         |  |   |  |
| **Segment Reporting Information [Abstract]**                                    |                                                                                                                                                                                         |  |   |  |
| Revenues from external customers                                                | 0us-gaap_RegulatedAndUnregulatedOperatingRevenue/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember                                                           |  | 0us-gaap_RegulatedAndUnregulatedOperatingRevenue/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  |
| Margin                                                                          | 0us-gaap_GrossProfit/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember                                                                                       |  | 0us-gaap_GrossProfit/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  |
| Operations and maintenance expenses                                             | 38pny_SegmentReportingInformationOperationsAndMaintenanceExpenses/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember                                          |  | 23pny_SegmentReportingInformationOperationsAndMaintenanceExpenses/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  |
| Income from equity method investments                                           | 4,494us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember                                                         |  | 6,834us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  |
| Operating income (loss) before income taxes                                     | (121)pny_SegmentOperatingIncomeLossBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember                                                       |  | (102)pny_SegmentOperatingIncomeLossBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  |
| Income before income taxes for reportable segments                              | 4,373us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember   |  | 6,732us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  |
| **Segment Reporting Information, Operating Income (Loss) [Abstract]**           |                                                                                                                                                                                         |  |   |  |
| Segment Operating Income Before Income Taxes                                    | 121pny_SegmentOperatingIncomeBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember                                                             |  | 102pny_SegmentOperatingIncomeBeforeIncomeTaxes/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  |
| **Segment Reporting Information, Profit (Loss) [Abstract]**                     |                                                                                                                                                                                         |  |   |  |
| Income before income taxes for reportable segments                              | $ 4,373us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  | $ 6,732us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest/ us-gaap_StatementBusinessSegmentsAxis= pny_NonUtilityUnregulatedActivitiesMember |  |
|                                                                                 |
| [1]See Note 12 for amounts attributable to affiliates.                          |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The component of income tax expense for the period representing amounts of income taxes paid or payable as determined by applying the provisions fo relevant enacted tax laws to relevant amounts of utility taxable income (loss).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of operating income or loss for the reportable segment before income taxes and extraordinary items
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of operating income or loss for the reportable segment before income taxes and extraordinary items
+ References
No definition available.
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| - Definition
Amount of operations and maintenance expenses included in measure of segment profit or loss
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.
+ References
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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.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net result for the period of deducting operating expenses from operating revenues.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                         |
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| - Definition
The total amount of operating revenues recognized during the period.
+ References
No definition available.
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