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Related Party Transactions - Other Related Party Transactions (Details) $ in Thousands			12 Months Ended
	Sep. 01, 2023 Company shares	Jan. 01, 2014 USD ($)	Dec. 31, 2025 USD ($) shares	Dec. 31, 2024 USD ($) shares	Dec. 18, 2025 USD ($) shares	Jun. 16, 2025 USD ($) shares	Apr. 29, 2025 USD ($) shares	Mar. 14, 2025 USD ($) shares
Related Party Transaction [Line Items]
Common stock, shares, issued (in shares) \| shares			50,132,605	42,679,569
Number of company owned \| Company	1
Preferred Class A \| NexAnnuity Holdings, Inc.
Related Party Transaction [Line Items]
Stock issued during period, new issues (in shares) \| shares	68,500		73,388	69,895
NexPoint Storage Partners Operating Company, LLC
Related Party Transaction [Line Items]
Percentage of ownership			33.81%
Number of shares purchased (in shares) \| shares						5,157.67	4,638.07	2,754.59
Aggregate amount						$ 3,600	$ 3,200	$ 2,000
NexPoint Storage Partners Operating Company, LLC \| Common Class B
Related Party Transaction [Line Items]
Common stock, shares, issued (in shares) \| shares			59,614.68
NSP
Related Party Transaction [Line Items]
Percentage of ownership			53.02%
Common stock, shares, issued (in shares) \| shares			89,365.19		2,996.19
Aggregate amount					$ 1,900
Property Management Fees \| Cityplace \| Reimbursements Member
Related Party Transaction [Line Items]
Cityplace Tower reimbursed			$ 1,500	$ 1,900
Property Management Fees \| NexVest Realty Advisors
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			$ 700	$ 700
Related party transaction, monthly expenses from transactions with related party		$ 1,200
Property Management Fees \| NexVest Realty Advisors \| Cityplace
Related Party Transaction [Line Items]
Management fee, percent			3.00%
Minimum management fee			$ 20,000
Property Management Fees \| NexVest Realty Advisors \| White Rock Center
Related Party Transaction [Line Items]
Management fee, percent			4.00%
Property Management Fees \| NexVest Realty Advisors \| Undeveloped Land in Plano, Texas
Related Party Transaction [Line Items]
Management fee, percent			3.00%
Guarantor on Loans
Related Party Transaction [Line Items]
Percentage of beneficiary trust indirectly owns			100.00%
Percentage directly owns general partnership interests			100.00%
Guarantor on Loans \| White Rock Center
Related Party Transaction [Line Items]
Additional principal amount			$ 10,000
Management Fee \| NexVest Realty Advisors \| Cityplace
Related Party Transaction [Line Items]
Minimum management fee			$ 750