| **Stockholders' Equity (Details) (USD $)Share data in Thousands, except Per Share data, unless otherwise specified**                                          | 0 Months Ended                                  | 3 Months Ended                                                                                                                                                                                                                                                                                                          |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]**                                                                    |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| Income from equity method investments                                                                                                                         |                                            | $ 8,265,000us-gaap_IncomeLossFromEquityMethodInvestments                                                                                                                                                                                                                                                                | $ 9,941,000us-gaap_IncomeLossFromEquityMethodInvestments |
| Income taxes                                                                                                                                                  |                                            | (3,264,000)pny_NonOperatingIncomeTaxExpenseBenefit                                                                                                                                                                                                                                                                      | (3,728,000)pny_NonOperatingIncomeTaxExpenseBenefit |
| Net income                                                                                                                                                    |                                            | 92,978,000us-gaap_NetIncomeLoss                                                                                                                                                                                                                                                                                         | 97,572,000us-gaap_NetIncomeLoss |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                                                                |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| Common Stock, Shares, Outstanding, Beginning Balance                                                                                                          |                                            | 78,531us-gaap_CommonStockSharesOutstanding                                                                                                                                                                                                                                                                              |   |
| Common Stock, Value, Issued, Beginning Balance                                                                                                                |                                            | 636,835,000us-gaap_CommonStockValue                                                                                                                                                                                                                                                                                     |   |
| Issued to participants in the Employee Stock Purchase Plan (ESPP) (in shares)                                                                                 |                                            | 7us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans                                                                                                                                                                                                                                                        |   |
| Issued to participants in the Employee Stock Purchase Plan (ESPP)                                                                                             |                                            | 279,000us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan                                                                                                                                                                                                                                                    |   |
| Issued to participants in the Dividend Reinvestment and Stock Purchase Plan (in shares)                                                                       |                                            | 126pny_StockIssuedDuringPeriodSharesDividendReinvestmentAndStockPurchasePlans                                                                                                                                                                                                                                           |   |
| Issued to participants in the Dividend Reinvestment and Stock Purchase Plan                                                                                   |                                            | 4,781,000pny_StockIssuedDuringPeriodValueDividendReinvestmentAndStockPurchasePlans                                                                                                                                                                                                                                      |   |
| Issued to participants in the Incentive Compensation Plan (ICP) (in shares)                                                                                   |                                            | 103us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation                                                                                                                                                                                                                                                          |   |
| Issued to participants in the Incentive Compensation Plan (ICP)                                                                                               |                                            | 3,935,000us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation                                                                                                                                                                                                                                                     |   |
| Costs from issuance of common stock                                                                                                                           |                                            | (137,000)pny_CostsOfStockIssuance                                                                                                                                                                                                                                                                                       |   |
| Common Stock, Shares, Outstanding, Ending Balance                                                                                                             |                                            | 78,767us-gaap_CommonStockSharesOutstanding                                                                                                                                                                                                                                                                              |   |
| Common Stock, Value, Issued, Ending Balance                                                                                                                   |                                            | 645,693,000us-gaap_CommonStockValue                                                                                                                                                                                                                                                                                     |   |
| ATM Sales Agreement Aggregate Amount                                                                                                                          | 170,000,000pny_ATMSalesAgreementAggregateAmount |                                                                                                                                                                                                                                                                                                                    |   |
| ATM Sales Agreement Commission Percentage                                                                                                                     | 1.50%pny_ATMSalesAgreementCommissionPercentage  |                                                                                                                                                                                                                                                                                                                    |   |
| Cash dividends paid per share of common stock (usd per share)                                                                                                 |                                            | $ 0.32us-gaap_CommonStockDividendsPerShareDeclared                                                                                                                                                                                                                                                                      | $ 0.31us-gaap_CommonStockDividendsPerShareDeclared |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                                  |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| Accumulated OCIL beginning balance, net of tax                                                                                                                |                                            | (237,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax                                                                                                                                                                                                                                                        | (284,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
| Total other comprehensive income (loss)                                                                                                                       |                                            | (827,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax                                                                                                                                                                                                                                                                   | 311,000us-gaap_OtherComprehensiveIncomeLossNetOfTax |
| Accumulated OCIL ending balance, net of tax                                                                                                                   |                                            | (1,064,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax                                                                                                                                                                                                                                                      | 27,000us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
| Reclassification out of Accumulated Other Comprehensive Income [Member]                                                                                       |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| **Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]**                                                                    |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| Net income                                                                                                                                                    |                                            | 117,000us-gaap_NetIncomeLoss/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember                                                                                                                                              | 137,000us-gaap_NetIncomeLoss/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember |
| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]                                                                           |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                                  |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| OCIL before reclassifications, net of tax                                                                                                                     |                                            | (944,000)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember                                                                                                                       | 174,000us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
| Amounts reclassified from accumulated OCIL, net of tax                                                                                                        |                                            | 117,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember                                                                                                        | 137,000us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
| Total other comprehensive income (loss)                                                                                                                       |                                            | (827,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember                                                                                                                                              | 311,000us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| **Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]**                                                                    |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| Income from equity method investments                                                                                                                         |                                            | 192,000us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember | 225,000us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
| Income taxes                                                                                                                                                  |                                            | (75,000)pny_NonOperatingIncomeTaxExpenseBenefit/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember      | (88,000)pny_NonOperatingIncomeTaxExpenseBenefit/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
| Net income                                                                                                                                                    |                                            | 117,000us-gaap_NetIncomeLoss/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember                         | 137,000us-gaap_NetIncomeLoss/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |
| Accumulated Defined Benefit Plans Adjustment [Member]                                                                                                         |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| **Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]**                                                                                  |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| Total other comprehensive income (loss)                                                                                                                       |                                            | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember                                                                                                                                                                            |   |
| Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]                               |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| **Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]**                                                                    |                                            |                                                                                                                                                                                                                                                                                                                    |   |
| Income from equity method investments                                                                                                                         |                                            | 0us-gaap_IncomeLossFromEquityMethodInvestments/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember                             |   |
| Income taxes                                                                                                                                                  |                                            | 0pny_NonOperatingIncomeTaxExpenseBenefit/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember                                   |   |
| Net income                                                                                                                                                    |                                            | $ 0us-gaap_NetIncomeLoss/ us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis= us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember                                                   |   |

| X                                                                                                                                                                                                                                                                                                                  |
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| - Definition
At-the market sales agreement to issue shares of common stock up to an aggregate sales price.
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No definition available.
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Sales commission percentage of sales price of all shares sold agreed to be paid to agents as part of the ATM Sales Agreement
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The cost incurred directly with the issuance of an equity security.
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| - Definition
The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of non-utility taxable income (loss) from continuing operations.
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| - Definition
Number of shares issued during the period from a dividend reinvestment plan (DRIP) or stock purchase plan. A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.
+ References
No definition available.
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| - Definition
Value of stock issued during the period from a dividend reinvestment plan (DRIP) or stock purchase plan. A dividend reinvestment plan allows the holder of the stock to reinvest dividends paid to them by the entity on new issues of stock by the entity.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate dividends declared during the period for each share of common stock outstanding.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
+ References
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| - Definition
Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.
+ 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.
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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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| - Definition
Amount after tax, before reclassification adjustments of other comprehensive income (loss).
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No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax and reclassification adjustments of other comprehensive income (loss).
+ References
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| - Definition
Amount after tax of reclassification adjustments of other comprehensive income (loss).
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No definition available.
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| - Definition
Number of shares issued during the period as a result of an employee stock purchase plan.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5
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| - Definition
Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5
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| - Definition
Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5
+ Details**Name:**us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
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| - Definition
Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5
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