| **Equity Method Investments (Details) (USD $)**        | 3 Months Ended                                                                                                                                                                                                       |                                                                                                                                                                                           |
|--------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
||
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Contributions to equity method investments             | $ 10,019,000us-gaap_PaymentsToAcquireEquityMethodInvestments                                                                                                                                                         | $ 9,960,000us-gaap_PaymentsToAcquireEquityMethodInvestments                                                                                                                               |   |
| Cardinal Pipeline Company [Member]                     |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Membership interest percentage                         | 21.49%us-gaap_EquityMethodInvestmentOwnershipPercentage/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_CardinalPipelineCompanyMember                                                     |                                                                                                                                                                                      |   |
| Related party costs                                    | 2,214,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_CardinalPipelineCompanyMember                            | 2,240,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_CardinalPipelineCompanyMember |   |
| Trade accounts payable                                 | 743,000us-gaap_DueToRelatedPartiesCurrent/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_CardinalPipelineCompanyMember                                                                   |                                                                                                                                                                                      | 747,000us-gaap_DueToRelatedPartiesCurrent/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_CardinalPipelineCompanyMember |
| Pine Needle Company [Member]                           |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Membership interest percentage                         | 45.00%us-gaap_EquityMethodInvestmentOwnershipPercentage/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_PineNeedleCompanyMember                                                           |                                                                                                                                                                                      |   |
| Related party costs                                    | 2,936,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_PineNeedleCompanyMember                                  | 2,793,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_PineNeedleCompanyMember       |   |
| Trade accounts payable                                 | 989,000us-gaap_DueToRelatedPartiesCurrent/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_PineNeedleCompanyMember                                                                         |                                                                                                                                                                                      | 989,000us-gaap_DueToRelatedPartiesCurrent/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_PineNeedleCompanyMember |
| South Star Energy Services [Member]                    |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Membership interest percentage                         | 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_SouthStarEnergyServicesMember                                                     |                                                                                                                                                                                      |   |
| Operating revenues                                     | 396,000us-gaap_RevenueFromRelatedParties/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_SouthStarEnergyServicesMember                                                                    | 432,000us-gaap_RevenueFromRelatedParties/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_SouthStarEnergyServicesMember                                         |   |
| Trade accounts receivable                              | 309,000us-gaap_DueFromRelatedPartiesCurrent/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_SouthStarEnergyServicesMember                                                                 |                                                                                                                                                                                      | 460,000us-gaap_DueFromRelatedPartiesCurrent/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_SouthStarEnergyServicesMember |
| Hardy Storage [Member]                                 |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Membership interest percentage                         | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_HardyStorageMember                                                                |                                                                                                                                                                                      |   |
| Related party costs                                    | 2,322,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_HardyStorageMember                                       | 2,425,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_HardyStorageMember            |   |
| Trade accounts payable                                 | 774,000us-gaap_DueToRelatedPartiesCurrent/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_HardyStorageMember                                                                              |                                                                                                                                                                                      | 774,000us-gaap_DueToRelatedPartiesCurrent/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_HardyStorageMember |
| Constitution Pipeline Company [Member]                 |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Membership interest percentage                         | 24.00%us-gaap_EquityMethodInvestmentOwnershipPercentage/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_ConstitutionPipelineCompanyMember                                                 |                                                                                                                                                                                      |   |
| Estimated Pipeline Costs Including AFUDC               | 875,000,000pny_EstimatedPipelineDevelopmentAndConstructionCostsIncludingAFUDC/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_ConstitutionPipelineCompanyMember                           |                                                                                                                                                                                      |   |
| Estimated Pipeline Costs Excluding AFUDC               | 785,000,000pny_EstimatedPipelineDevelopmentAndConstructionCostsExcludingAFUDC/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_ConstitutionPipelineCompanyMember                           |                                                                                                                                                                                      |   |
| Contributions to equity method investments             | 4,900,000us-gaap_PaymentsToAcquireEquityMethodInvestments/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_ConstitutionPipelineCompanyMember                                               |                                                                                                                                                                                      |   |
| Total equity contribution for the project              | 58,500,000pny_TotalContributionsToEquityMethodInvestmentsForProject/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_ConstitutionPipelineCompanyMember                                     |                                                                                                                                                                                      |   |
| Pipeline Target In Service Date                        | second half of 2016                                                                                                                                                                                                  |                                                                                                                                                                                      |   |
| Atlantic Coast Pipeline [Member]                       |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Membership interest percentage                         | 10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_AtlanticCoastPipelineMember                                                       |                                                                                                                                                                                      |   |
| Contributions to equity method investments             | 5,100,000us-gaap_PaymentsToAcquireEquityMethodInvestments/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_AtlanticCoastPipelineMember                                                     |                                                                                                                                                                                      |   |
| Pipeline Target In Service Date                        | late 2018                                                                                                                                                                                                            |                                                                                                                                                                                      |   |
| Long term purchase commitment time period              | 20 years                                                                                                                                                                                                             |                                                                                                                                                                                      |   |
| Estimated Percentage Project Financing                 | 70.00%pny_EstimatedPercentageProjectFinancing/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_AtlanticCoastPipelineMember                                                                 |                                                                                                                                                                                      |   |
| Minimum [Member] | Atlantic Coast Pipeline [Member]    |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Estimated Pipeline Development And Construction Costs  | 4,500,000,000pny_EstimatedPipelineDevelopmentAndConstructionCosts/ us-gaap_RangeAxis= us-gaap_MinimumMember/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_AtlanticCoastPipelineMember   |                                                                                                                                                                                      |   |
| Maximum [Member] | Atlantic Coast Pipeline [Member]    |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| **Schedule of Equity Method Investments [Line Items]** |                                                                                                                                                                                                                 |                                                                                                                                                                                      |   |
| Estimated Pipeline Development And Construction Costs  | $ 5,000,000,000pny_EstimatedPipelineDevelopmentAndConstructionCosts/ us-gaap_RangeAxis= us-gaap_MaximumMember/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis= pny_AtlanticCoastPipelineMember |                                                                                                                                                                                      |   |

| X                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The estimated percentage of financing the joint venture members expect to obtain to finance the project.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total estimated cost pertaining to the development and construction of new pipeline.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total estimated cost pertaining to the development and construction of the new pipeline, excluding an allowance for funds used during construction (AFUDC).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                              |
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| - Definition
Total estimated cost pertaining to the development and construction of the new pipeline, including an allowance for funds used during construction (AFUDC).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Target date for the pipeline to be placed into service, in CCYY-MM-DD format.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total cash outflow associated with advances to an equity method investments, which are investments in joint ventures.
+ References
No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle).
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.
+ References
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| - Definition
Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.
+ References
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| - Definition
Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.
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