v3.26.1
Fair Value of Financial Instruments - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 52,860 $ 49,104
Level 3 | NexPoint Storage Partners | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 24,892 $ 24,761
Level 3 | NexPoint Storage Partners | Discounted cash flow | Terminal cap rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0513 0.05
Level 3 | NexPoint Storage Partners | Discounted cash flow | Terminal cap rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0563 0.055
Level 3 | NexPoint Storage Partners | Discounted cash flow | Terminal cap rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0538 0.0525
Level 3 | NexPoint Storage Partners | Discounted cash flow | Discount rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.07 0.07
Level 3 | NexPoint Storage Partners | Discounted cash flow | Discount rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.09 0.09
Level 3 | NexPoint Storage Partners | Discounted cash flow | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.08 0.08
Level 3 | NSP | Series G Preferred Stock | Transaction Indication of Value | Cost price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 3,269 $ 3,161
Level 3 | IQHQ Inc. | Market approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 136,739 $ 141,186
Level 3 | IQHQ Inc. | Market approach | Marketability discount | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.20 0.275
Level 3 | IQHQ Inc. | Market approach | Marketability discount | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.41 0.485
Level 3 | IQHQ Inc. | Market approach | Marketability discount | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.305 0.38
Level 3 | IQHQ Inc. | Series D Preferred Stock | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 18,616 $ 18,616
Level 3 | IQHQ Inc. | Series D Preferred Stock | Discounted cash flow | Discount rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.155 0.155
Level 3 | IQHQ Inc. | Series D Preferred Stock | Discounted cash flow | Discount rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.17 0.175
Level 3 | IQHQ Inc. | Series D Preferred Stock | Discounted cash flow | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1625 0.16
Level 3 | IQHQ Inc. | Series E Preferred Stock | Discounted cash flow    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 136,081 $ 136,115
Level 3 | IQHQ Inc. | Series E Preferred Stock | Discounted cash flow | Discount rate | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1601 0.1601
Level 3 | IQHQ Inc. | Series E Preferred Stock | Discounted cash flow | Discount rate | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1751 0.1751
Level 3 | IQHQ Inc. | Series E Preferred Stock | Discounted cash flow | Discount rate | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.1676 0.1676
Level 3 | Private REIT | Market approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 27,968 $ 24,343
Level 3 | Private REIT | Market approach | NAV per share multiple | Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0085 0.0085
Level 3 | Private REIT | Market approach | NAV per share multiple | Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0105 0.0105
Level 3 | Private REIT | Market approach | NAV per share multiple | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Measurement input 0.0095 0.0095
Level 3 | FREMF 2020-KF81 C | Market approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 3,756,225 $ 4,005,397
Level 3 | FREMF 2020-KF81 C | Market approach | Weighted Average    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity securities $ 155,370 $ 187,000