Equity Method Investments - Schedule of Equity Method Investments (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($) a
Schedule of Equity Method Investments [Line Items]
Investment Basis	$ 33,865	$ 54,429
Share of Investee's Net Assets	15,293	29,906
Basis Difference	18,572	24,523
Share of Earnings (Loss)	752	1,465
Fair Value	$ 365,819	$ 398,491
Allenby, LLC
Schedule of Equity Method Investments [Line Items]
Effective ownership		50.00%
Haygood, LLC.
Schedule of Equity Method Investments [Line Items]
Effective ownership		31.00%
Claymore Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Effective ownership		50.00%
Sandstone Pasadena Apartments, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	50.00%	50.00%
Investment Basis	$ 9,667	$ 10,055
Share of Investee's Net Assets	(9,590)	(9,590)
Basis Difference	19,257	19,645
Share of Earnings (Loss)	$ 341	$ 70
AM Uptown Hotel, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	60.00%	60.00%
Investment Basis	$ (1,340)	$ 18,081
Share of Investee's Net Assets	101	14,970
Basis Difference	(1,441)	3,111
Share of Earnings (Loss)	$ 101	$ (155)
Las Vegas Land Owner, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	77.00%	77.00%
Investment Basis	$ 12,322	$ 12,321
Share of Investee's Net Assets	12,323	12,321
Basis Difference	(1)	0
Share of Earnings (Loss)	$ 2	$ 10
Perilune Aero Equity Holdings One, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	16.40%	16.40%
Investment Basis	$ 12,602	$ 13,565
Share of Investee's Net Assets	10,742	10,488
Basis Difference	1,860	3,077
Share of Earnings (Loss)	$ 102	$ 1,414
Capital Acquisitions Partners, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	20.90%	20.90%
Investment Basis	$ 614	$ 407
Share of Investee's Net Assets	1,717	1,717
Basis Difference	(1,103)	(1,310)
Share of Earnings (Loss)	$ 206	$ 126
NexPoint Real Estate Finance Operating Partnership, L.P.
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	15.60%	15.60%
Fair Value	$ 67,145	$ 76,396
NexPoint Real Estate Finance, Inc.
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	11.80%	12.00%
Fair Value	$ 28,959	$ 32,949
Claymore Holdings, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	50.00%	50.00%
Fair Value	$ 0	$ 0
Allenby, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership		50.00%
Fair Value		$ 0
Haygood, LLC.
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership		31.00%
Fair Value		$ 0
LLV Holdco, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	26.80%	26.80%
Fair Value	$ 2,918	$ 2,606
NexPoint Storage Partners, Inc.
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	52.80%	52.80%
Fair Value	$ 50,844	$ 62,709
NexPoint Storage Partners Operating Company, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	35.70%	29.50%
Fair Value	$ 35,094	$ 34,172
VineBrook Homes Operating Partnership, L.P.
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	11.60%	11.40%
Fair Value	$ 134,076	$ 151,706
NexPoint SFR Operating Partnership, L.P.
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	30.80%	30.80%
Fair Value	$ 33,322	$ 37,953
AMS C-Store JV, LLC
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership	100.00%
Fair Value	$ 13,461
Tivoli North Property
Schedule of Equity Method Investments [Line Items]
NXDT Percentage Ownership		100.00%
Percentage of ownership in real estate property		77.00%
Tivoli North Property | Las Vegas Land Owner, LLC
Schedule of Equity Method Investments [Line Items]
Area of land (acre) | a		8.5