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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of equity interest in joint ventures, maximum | 50.00% |  |
Difference between cost of investments and the net book value of underlying net assets | $ 0.6 | $ 0.7 |
Development, management and leasing fees recognized from unconsolidated affiliates | 1.0 | 0.5 | $ 0.4
Receivables from management and leasing fees | $ 0.2 | $ 0.1 |
Plaza Colonnade, Tenant-in-Common [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of equity interest in joint ventures, maximum | 50.00% |  |
Kessinger/Hunter & Company, LC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of equity interest in joint ventures, maximum | 26.50% |  |
Highwoods DLF Forum, LLC Joint Venture [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of equity interest in joint ventures, maximum | 25.00% |  |
Percentage of partner's interest in asset acquired (in hundredths) | 75.00% |  |
Highwoods-Markel Associates, LLC Joint Venture [Member] |  |  |
Consolidated Affiliates: |  |  |
Percentage of equity interest in consolidated affiliates | 50.00% |  |
Fair value of noncontrolling interests in consolidated affiliate | $ 30.7 |  |

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