| Document | Feb. 25, 2020 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Feb. 25, 2020 |
| Entity Registrant Name | Piedmont Office Realty Trust, Inc. |
| Entity File Number | 001-34626 |
| Entity Incorporation, State or Country Code | MD |
| Entity Tax Identification Number | 58-2328421 |
| Entity Address, Address Line One | 5565 Glenridge Connector |
| Entity Address, Address Line Two | Suite 450 |
| Entity Address, City or Town | Atlanta, |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30342 |
| City Area Code | (770) |
| Local Phone Number | 418-8800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | PDM |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001042776 |
| Amendment Flag | false |
