Investments In and Advances To Affiliates (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) ft²	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Difference between cost of investments and the net book value of underlying net assets	$ 15,600	$ 21,300
Gain on deconsolidation of affiliate	0	0	$ 11,778
Loss on disposition of investment in unconsolidated affiliate	(4,700)	0	0
Repayments of preferred equity from unconsolidated affiliates	0	0	80,000
Additional common equity contribution	$ 28,488	153,361	132,609
Rentable square feet of office property under development (in sq feet) | ft²	1,400,000
Development, management and leasing fees recognized from unconsolidated affiliates	$ 500	900	$ 1,000
HRLP MTW, LLC [Member]
Unconsolidated Affiliates:
Effective interest rate (in hundredths)			7.29%
Contribution of cash to acquire interest in joint venture	20,000
Partner's contribution of property to acquire interest in joint venture	5,000
Advance to affiliate	$ 46,300
Consolidated Affiliate:
Percentage of equity interest in consolidated affiliates	80.00%
Contribution of cash to acquire interest in joint venture	$ 20,000
Partner's contribution of property to acquire interest in joint venture	5,000
Advance to affiliate	$ 46,300
Principal amount of debt			$ 45,000
Term of debt instrument			5 years
Debt issuance costs			$ 800
Term of exercisable right (in years)	2 years
HRLP MTW, LLC [Member] | Ownership Percentage [Member]
Consolidated Affiliate:
Partner's interest in consolidated joint venture (in hundredths)	20.00%
Highwoods-Markel Associates, LLC Joint Venture [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Gain on deconsolidation of affiliate			$ 11,800
Loss on disposition of investment in unconsolidated affiliate	$ 4,700
Granite Park Six JV, LLC [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Total anticipated development costs	$ 200,000
Equity funded to acquire interest in joint venture	76,800
Construction loan obtained by joint venture	$ 115,000	70,900
Interest rate basis	SOFR
Interest rate, basis spread (in hundredths)	3.94%
Interest rate cap (in hundredths)	3.50%
Amount of loan funded to affiliate	$ 16,200
Contribution of cash from affiliate		35,500
Consolidated Affiliate:
Term of exercisable right (in years)	2 years
GPI 23 Springs JV, LLC [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Total anticipated development costs	$ 460,000
Equity funded to acquire interest in joint venture	95,200
Construction loan obtained by joint venture	$ 265,000
Interest rate basis	SOFR
Interest rate, basis spread (in hundredths)	3.55%
Term of optional extension	2 years
Interest rate cap (in hundredths)	3.50%
Amount of borrowings outstanding, subject to swaps	$ 223,900
Amount of loan funded to affiliate	$ 161,300
Consolidated Affiliate:
Term of exercisable right (in years)	2 years
M+O JV, LLC [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Equity funded to acquire interest in joint venture	$ 86,400
Interest rate basis			SOFR
Interest rate, basis spread (in hundredths)			3.50%
Fair value of debt assumed from acquisition	$ 137,000
Stated interest rate (in hundredths)	4.50%
Effective interest rate (in hundredths)	5.30%
Repayments of preferred equity from unconsolidated affiliates			$ 80,000
Additional common equity contribution			$ 40,000
Contribution of cash from affiliate		62,100
Consolidated Affiliate:
Principal amount of debt		$ 134,300
Term of exercisable right (in years)	2 years
Midtown East Tampa, LLC [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Total anticipated development costs	$ 83,000
Equity funded to acquire interest in joint venture	$ 14,100
Interest rate basis	SOFR
Interest rate, basis spread (in hundredths)	4.50%
Amount of loan funded to affiliate	$ 35,200
Rentable square feet of office property under development (in sq feet) | ft²	143,000
Total rentable square feet of property under development (in sq feet) | ft²	432,000
Advance to affiliate	$ 52,300
Consolidated Affiliate:
Advance to affiliate	$ 52,300
Brand/HRLP 2827 Peachtree LLC [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Total anticipated development costs	$ 79,000
Interest rate basis	SOFR
Interest rate, basis spread (in hundredths)	3.10%
Term of optional extension	2 years	1 year
Amount of loan funded to affiliate	$ 49,900
Contribution of cash to acquire interest in joint venture	13,300
Partner's contribution of property to acquire interest in joint venture	7,700
Contribution of cash from affiliate	5,600
Advance to affiliate	52,800
Consolidated Affiliate:
Contribution of cash to acquire interest in joint venture	13,300
Partner's contribution of property to acquire interest in joint venture	7,700
Advance to affiliate	$ 52,800
Term of exercisable right (in years)	2 years
Plaza Colonnade, Tenant-in-Common [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%
Kessinger/Hunter & Company, LC [Member]
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	26.50%
Markel Development Land Joint Venture
Unconsolidated Affiliates:
Percentage of equity interest in joint ventures, maximum	50.00%