Investments in Real Estate Subsidiaries - Schedule of Investments in SPEs Properties (Details) - a	Jun. 30, 2026	Dec. 31, 2025
White Rock Center \| Special Purpose Entities Directly Owned Companies
Summary of Investment Holdings [Line Items]
Effective ownership (as a percent)	100.00%	100.00%
5916 W Loop 289 \| Special Purpose Entities Directly Owned Companies
Summary of Investment Holdings [Line Items]
Effective ownership (as a percent)	100.00%	100.00%
Cityplace \| Special Purpose Entities Directly Owned Companies
Summary of Investment Holdings [Line Items]
Effective ownership (as a percent)	100.00%	100.00%
NexPoint Dominion Land, LLC \| Undeveloped Land in Plano, Texas
Summary of Investment Holdings [Line Items]
Area of land (acre)	2.15
NexPoint Dominion Land, LLC \| Special Purpose Entities Directly Owned Companies
Summary of Investment Holdings [Line Items]
Effective ownership (as a percent)	100.00%	100.00%
Dallas Hilton Garden Inn \| Special Purpose Entities Directly Owned Companies
Summary of Investment Holdings [Line Items]
Effective ownership (as a percent)	100.00%	100.00%
St. Petersburg Marriott \| Special Purpose Entities Directly Owned Companies
Summary of Investment Holdings [Line Items]
Effective ownership (as a percent)	100.00%	100.00%
Hyatt Place Park City \| Special Purpose Entities Directly Owned Companies
Summary of Investment Holdings [Line Items]
Effective ownership (as a percent)	100.00%	100.00%
Bradenton Hampton Inn & Suites \| Special Purpose Entities Directly Owned Companies
Summary of Investment Holdings [Line Items]
Effective ownership (as a percent)	0.00%	100.00%