| **Employee Share-Based Plans (Details) (USD $)**                                                                                           | 3 Months Ended                                                                                                                                                                                                                                                                                                                        | 1 Months Ended                                            | 0 Months Ended                                                                                                                                                                                                                                                               |                                                                                                                                                                                                                                                                                                           |                                                                                           |
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| **Employee Share Based Plans Details [Line Items]**                                                                                        |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Maximum allowable withholdings                                                                                                             | 50.00%pny_MaximumPlanWithholdingsAllowed                                                                                                                                                                                                                                                                                              |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Compensation expense                                                                                                                       | $ 2,230,000us-gaap_AllocatedShareBasedCompensationExpense                                                                                                                                                                                                                                                                             | $ 2,100,000us-gaap_AllocatedShareBasedCompensationExpense |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Liability                                                                                                                                  | 10,093,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent                                                                                                                                                                                                                                             |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      | 15,130,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent |   |
| ESPP exercise price as a percent                                                                                                           | 95.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent                                                                                                                                                                                                                              |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Stock Compensation Plan [Member]                                                                                                           |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| **Employee Share Based Plans Details [Line Items]**                                                                                        |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Performance period                                                                                                                         | 3 years                                                                                                                                                                                                                                                                                                                               |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Retention Stock Unit Award President And Cheif Executive Officer [Member] | Stock Compensation Plan [Member]                               |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| **Employee Share Based Plans Details [Line Items]**                                                                                        |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Retention stock unit award vesting period                                                                                                  | 5 years                                                                                                                                                                                                                                                                                                                               |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Unvested Shares Issued To CEO                                                                                                              |                                                                                                                                                                                                                                                                                                                                  |                                                      | 64,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod/ us-gaap_AwardTypeAxis= us-gaap_StockCompensationPlanMember/ us-gaap_PlanNameAxis= pny_RetentionStockUnitAwardPresidentAndCheifExecutiveOfficerMember |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Incentive Compensation Plan Percentage Of Common Stock Vested                                                                              | In accordance with the vesting schedule, 20% of the units vested on December 15, 2014, 30% of the units vest on December 15, 2015 and 50% of the units vest on December 15, 2016                                                                                                                                       |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Vested on December 15, 2014 | Retention Stock Unit Award President And Cheif Executive Officer [Member] | Stock Compensation Plan [Member] |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| **Employee Share Based Plans Details [Line Items]**                                                                                        |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Common stock vesting percentage                                                                                                            | 20.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage/ us-gaap_AwardTypeAxis= us-gaap_StockCompensationPlanMember/ us-gaap_PlanNameAxis= pny_RetentionStockUnitAwardPresidentAndCheifExecutiveOfficerMember/ us-gaap_VestingAxis= us-gaap_ShareBasedCompensationAwardTrancheOneMember   |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Stock Award Vested, Shares, Gross                                                                                                          |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         | 14,461pny_StockAwardVestedSharesGross/ us-gaap_AwardTypeAxis= us-gaap_StockCompensationPlanMember/ us-gaap_PlanNameAxis= pny_RetentionStockUnitAwardPresidentAndCheifExecutiveOfficerMember/ us-gaap_VestingAxis= us-gaap_ShareBasedCompensationAwardTrancheOneMember                                     |                                                                                      |   |
| Payments Related to Tax Withholding for Share-based Compensation                                                                           |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         | $ 300,000us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation/ us-gaap_AwardTypeAxis= us-gaap_StockCompensationPlanMember/ us-gaap_PlanNameAxis= pny_RetentionStockUnitAwardPresidentAndCheifExecutiveOfficerMember/ us-gaap_VestingAxis= us-gaap_ShareBasedCompensationAwardTrancheOneMember |                                                                                      |   |
| Stock Issued During Period, Shares, Share-based Compensation, Gross                                                                        |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         | 7,231us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross/ us-gaap_AwardTypeAxis= us-gaap_StockCompensationPlanMember/ us-gaap_PlanNameAxis= pny_RetentionStockUnitAwardPresidentAndCheifExecutiveOfficerMember/ us-gaap_VestingAxis= us-gaap_ShareBasedCompensationAwardTrancheOneMember     |                                                                                      |   |
| Share Price                                                                                                                                |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      | $ 37.89us-gaap_SharePrice/ us-gaap_AwardTypeAxis= us-gaap_StockCompensationPlanMember/ us-gaap_PlanNameAxis= pny_RetentionStockUnitAwardPresidentAndCheifExecutiveOfficerMember/ us-gaap_VestingAxis= us-gaap_ShareBasedCompensationAwardTrancheOneMember |
| Vest on December 15, 2015 | Retention Stock Unit Award President And Cheif Executive Officer [Member] | Stock Compensation Plan [Member]   |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| **Employee Share Based Plans Details [Line Items]**                                                                                        |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Common stock vesting percentage                                                                                                            | 30.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage/ us-gaap_AwardTypeAxis= us-gaap_StockCompensationPlanMember/ us-gaap_PlanNameAxis= pny_RetentionStockUnitAwardPresidentAndCheifExecutiveOfficerMember/ us-gaap_VestingAxis= us-gaap_ShareBasedCompensationAwardTrancheTwoMember   |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Vest on December 15, 2016 | Retention Stock Unit Award President And Cheif Executive Officer [Member] | Stock Compensation Plan [Member]   |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| **Employee Share Based Plans Details [Line Items]**                                                                                        |                                                                                                                                                                                                                                                                                                                                  |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |
| Common stock vesting percentage                                                                                                            | 50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage/ us-gaap_AwardTypeAxis= us-gaap_StockCompensationPlanMember/ us-gaap_PlanNameAxis= pny_RetentionStockUnitAwardPresidentAndCheifExecutiveOfficerMember/ us-gaap_VestingAxis= us-gaap_ShareBasedCompensationAwardTrancheThreeMember |                                                      |                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                                                                                                                      |                                                                                      |   |

| X                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum income tax withholdings each participant is allowed to have withheld under ICP plan.
+ References
No definition available.
+ Details**Name:**pny_MaximumPlanWithholdingsAllowed**Namespace Prefix:**pny_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of performance periods under ICP Plans awarded based on the level of performance achieved by Piedmont for a rolling performance period.
+ References
No definition available.
+ Details**Name:**pny_NumberOfPerformancePeriodsUnderIcpPlansPerformanceAwards**Namespace Prefix:**pny_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total number of retention shares vested during the period, gross of tax withholding.
+ References
No definition available.
+ Details**Name:**pny_StockAwardVestedSharesGross**Namespace Prefix:**pny_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F
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| X                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.
+ References
No definition available.
+ Details**Name:**us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585
+ Details**Name:**us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
+ Details**Name:**us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1**Namespace Prefix:**us-gaap_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of vesting of share-based compensation awards.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
+ Details**Name:**us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Purchase price of common stock expressed as a percentage of its fair value.
+ References
No definition available.
+ Details**Name:**us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent**Namespace Prefix:**us-gaap_**Data Type:**num:percentItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Price of a single share of a number of saleable stocks of a company.
+ References
No definition available.
+ Details**Name:**us-gaap_SharePrice**Namespace Prefix:**us-gaap_**Data Type:**num:perShareItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Gross 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). 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
No definition available.
+ Details**Name:**us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross**Namespace Prefix:**us-gaap_**Data Type:**xbrli:sharesItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |
| X                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|
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