| **Employee Share-Based Plans (Details) - USD ($) $ / shares in Units, $ in Thousands**                                   |          | 1 Months Ended | 3 Months Ended | 9 Months Ended |                                                                                                                                                                                                                                                                                                                                            |         |         |
|--------------------------------------------------------------------------------------------------------------------------|----------|----------------|----------------|----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|
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| **Employee Share Based Plans Details [Line Items]**                                                                      |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Share Price                                                                                                              |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    | $ 56.85 |   |   |
| Compensation expense                                                                                                     |     |           | $ 1,534        | $ 1,317        | $ 9,400                                                                                                                                                                                                                                                                                                                                    | $ 4,596 |    |   |   |
| Liability                                                                                                                |     |           | $ 12,895       |           | $ 12,895                                                                                                                                                                                                                                                                                                                                   |    |    | $ 22,037 |   |
| Business Acquisition, Share Price                                                                                        |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   | $ 60 |
| ESPP exercise price as a percent                                                                                         |     |           |           |           | 95.00%                                                                                                                                                                                                                                                                                                                                     |    |    |   |   |
| Stock Compensation Plan                                                                                                  |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| **Employee Share Based Plans Details [Line Items]**                                                                      |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Performance period                                                                                                       |     |           |           |           | 3 years                                                                                                                                                                                                                                                                                                                                    |    |    |   |   |
| 2018 Plan Performance Awards | Stock Compensation Plan                                                                   |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| **Employee Share Based Plans Details [Line Items]**                                                                      |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Percentage                       |     |           |           |           | 100.00%                                                                                                                                                                                                                                                                                                                                    |    |    |   |   |
| Retention Stock Unit Award President And Chief Executive Officer | Stock Compensation Plan                               |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| **Employee Share Based Plans Details [Line Items]**                                                                      |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Unvested Shares Issued To CEO                                                                                            |     | 64,700         |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Retention stock unit award vesting period                                                                                |     |           |           |           | 5 years                                                                                                                                                                                                                                                                                                                                    |    |    |   |   |
| Incentive Compensation Plan Percentage Of Common Stock Vested                                                            |     |           |           |           | In accordance with the vesting schedule, 20% of the units vested on December 15, 2014 and 30% of the units vested on December 15, 2015. The remaining 50% of the units that vest on December 15, 2016 (2016 RSU) were accelerated as authorized by the Compensation Committee of our Board of Directors as discussed below. |    |    |   |   |
| Retention Stock Unit Award President And Chief Executive Officer | Vested on December 15, 2014 | Stock Compensation Plan |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| **Employee Share Based Plans Details [Line Items]**                                                                      |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Common stock vesting percentage                                                                                          |     |           |           |           | 20.00%                                                                                                                                                                                                                                                                                                                                     |    |    |   |   |
| Retention Stock Unit Award President And Chief Executive Officer | Vest on December 15, 2015 | Stock Compensation Plan   |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| **Employee Share Based Plans Details [Line Items]**                                                                      |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Common stock vesting percentage                                                                                          |     |           |           |           | 30.00%                                                                                                                                                                                                                                                                                                                                     |    |    |   |   |
| Stock Award Vested, Shares, Gross                                                                                        | 22,434   |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Payments Related to Tax Withholding for Share-based Compensation                                                         | $ 600    |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Stock Issued During Period, Shares, Share-based Compensation, Gross                                                      | 11,732   |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Retention Stock Unit Award President And Chief Executive Officer | Vest on December 15, 2016 | Stock Compensation Plan   |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| **Employee Share Based Plans Details [Line Items]**                                                                      |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Common stock vesting percentage                                                                                          |     |           |           |           | 50.00%                                                                                                                                                                                                                                                                                                                                     |    |    |   |   |
| Stock Issued During Period, Shares, Restricted Nonvested Stock Award                                                     | 19,554   |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Stock Issued During Period, Value, Restricted, Nonvested Stock Award                                                     | $ 1,100  |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Value Of Incentive Compensation Plan Award Issued Gross                                                                  | $ 2,100  |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Long Term Incentive Plan Three Performance Measures | Stock Compensation Plan                                            |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| **Employee Share Based Plans Details [Line Items]**                                                                      |     |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Acceleration And Payout Election Rate                                                                                    | 96.00%   |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Stock Issued During Period, Shares, Restricted Nonvested Stock Award                                                     | 162,390  |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Value of Incentive Compensation Plan Award Gross                                                                         | $ 17,400 |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |
| Stock Issued During Period, Value, Restricted, Nonvested Stock Award                                                     | $ 9,200  |           |           |           |                                                                                                                                                                                                                                                                                                                                       |    |    |   |   |

| X                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The rate at which plan participants elected acceleration and payout of share-based awards.
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| 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
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The percentage of plan performance awards that will be subject to accelerated vesting upon certain types of employment termination following the consummation of the proposed acquisition.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total number of retention shares vested during the period, gross of tax withholding.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The number of non-vested, restricted equity-based payment instrument, excluding stock (or unit) options, that were issued to the participant under accelerated incentive compensation plans.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                              |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate value of stock related to Restricted, Nonvested Stock Awards issued under accelerated incentive compensation plans during the period.
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| X                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate value of the accelerated Incentive Compensation Plan (ICP) award before reducing the award for the amount of income taxes withheld.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate value of Incentive Compensation Plan (ICP) awards issued before tax withholdings.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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| - Definition
Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.
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No definition available.
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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.
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| - 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
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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| - 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
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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| X                                                                                                                                                                                                                                                                     |
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| - Definition
Price of a single share of a number of saleable stocks of a company.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of vesting of share-based compensation awards.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                            |
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| - Definition
Purchase price of common stock expressed as a percentage of its fair value.
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No definition available.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
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