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Investments In and Advances To Affiliates (Details) - USD ($)
$ in Millions
12 Months Ended
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