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Limited Partnerships (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2025 | Sep. 30, 2025 | Apr. 30, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Dec. 31, 2024 | Aug. 31, 2024 | Apr. 30, 2024
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Intercompany Loan, Amount |  | $ 1,100,000 |  | $ 1,100,000 |  | $ 1,100,000 |  | $ 1,100,000 |
Cash and cash equivalents |  | 55,040,000 |  | $ 55,040,000 |  | 55,040,000 | $ 20,178,000 |  |
Partners' Capital, Distributions Policies |  |  |  | the parties to The Saint June, L.P. partnership agreement entered into an amendment to allow for up to $3.0 million of distributions to the partners between September 1, 2025 through September 30, 2027 prior to the partnership’s repayment of the operating loans |  |  |  |  |
Stratus Properties Inc |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 3,800,000 |  | $ 3,800,000 |  | $ 3,800,000 |  |  |
Saint George L.P. | Stratus Properties Inc |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 10.00% |  | 10.00% |  | 10.00% |  |  |
Proceeds from Contributions from Parent |  |  |  | $ 323,000 | $ 400,000 |  |  |  |
Saint George L.P. | Unrelated Equity Investor |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Contributions from Parent |  |  |  | 2,900,000 | 3,600,000 |  |  |  |
Stratus Block 150, L.P. |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Intercompany Loan, Amount |  | $ 1,500,000 |  | 1,500,000 | 2,400,000 | $ 1,500,000 |  |  |
Intercompany Loan, Outstanding |  | $ 8,300,000 |  | $ 8,300,000 |  | $ 8,300,000 |  |  |
Stratus Block 150, L.P. | Stratus Properties Inc |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 31.00% |  | 31.00% |  | 31.00% |  |  |
Intra-Entity Loan, Description |  |  |  |  |  | Stratus has made operating loans to Stratus Block 150, L.P. to facilitate the partnership’s ability to pay ongoing costs, including debt service, of The Annie B project during the pre-construction period. The loans bear interest at one-month Term Secured Overnight Financing Rate (SOFR) plus 5.00 percent, are subordinate to The Annie B land loan and must be repaid before distributions may be made to the partners. In first-quarter 2024, Stratus made an operating loan of $2.4 million. In third-quarter 2024, Stratus made an operating loan of $1.1 million. In first-quarter 2025, Stratus made an operating loan of $1.5 million. In third-quarter 2025, Stratus made an operating loan of $1.1 million. As of September 30, 2025, Stratus’ operating loans outstanding to Stratus Block 150, L.P. totaled $8.3 million. |  |  |
Basis spread on variable rate |  |  | 5.00% |  |  |  |  |  |
Saint June, L.P. |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Intra-Entity Loan, Description |  |  |  |  |  | Stratus and the Class B limited partner in The Saint June partnership have made operating loans to The Saint June, L.P. to support the partnership’s ability to pay its construction loan interest, which has exceeded the amount anticipated because of prior interest rate increases. The loans bear interest at one-month Term SOFR plus 5.00 percent, are subordinate to The Saint June construction loan and, unless approved by all partners, no distributions may be made to the partners until the operating loans are repaid. In third-quarter 2025, The Saint June partnership was amended to allow for up to $3.0 million of distributions to the partners prior to the repayment of the operating loans. In first-quarter 2024, Stratus made an operating loan of $339 thousand, and the Class B limited partner made an operating loan of $339 thousand to The Saint June, L.P. In second-quarter 2024, Stratus made an operating loan of $85 thousand, and the Class B limited partner made an operating loan of $165 thousand to The Saint June, L.P. No loans were made in third-quarter 2024 or the first nine months of 2025 |  |  |
Saint June, L.P. | Stratus Properties Inc |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 34.13% |  | 34.13% |  | 34.13% |  |  |
Basis spread on variable rate |  |  |  |  |  | 5.00% |  |  |
Intercompany Loan, Amount |  | $ 0 |  | $ 0 | 339,000 | $ 0 |  |  | $ 85,000
Intercompany Loan, Outstanding |  |  |  |  | 962,000 |  |  |  |
Saint June, L.P. | Stratus Properties Inc | Subsequent event |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid | $ 225,000 |  |  |  |  |  |  |  |
Saint June, L.P. | Unrelated Equity Investor |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Intercompany Loan, Amount |  |  |  |  | 339,000 |  |  |  | $ 165,000
Intercompany Loan, Outstanding |  |  |  |  | $ 493,000 |  |  |  |
Distribution Made to Limited Partner, Maximum Cash Distributions Allowed |  | 1,500,000 |  | 3,000,000 |  |  |  |  |
Saint June, L.P. | Unrelated Equity Investor | Subsequent event |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid | $ 435,000 |  |  |  |  |  |  |  |
Holden Hills |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Advances to Affiliate |  | $ 1,300,000 |  | $ 1,300,000 |  | $ 1,300,000 |  |  |
Holden Hills | Stratus Properties Inc |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  | 50.00% |  | 50.00% |  |  |
Stratus Kingwood, L.P. [Member] | Stratus Properties Inc |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 60.00% |  | 60.00% |  | 60.00% |  |  |
Holden Hills Phase 2 |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Initial Project Cost |  |  |  | $ 800,000 |  |  |  |  |
Management Fee Expense |  |  |  | $ 39,875 |  |  |  |  |
Property Management Fee, Percent Fee |  |  |  | 4.00% |  |  |  |  |
Advances to Affiliate |  | $ 1,600,000 |  | $ 1,600,000 |  | $ 1,600,000 |  |  |
Holden Hills Phase 2 | Stratus Properties Inc |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  | 50.00% |  | 50.00% |  |  |
Proceeds from Partnership Contribution |  |  |  | $ 95,700,000 |  |  |  |  |
Payments of Distributions to Affiliates |  |  |  | 47,800,000 |  |  |  |  |
Holden Hills Phase 2 | Stratus Properties Inc | Holden Hills Phase 2 Land |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Partnership Contribution |  |  |  | 86,900,000 |  |  |  |  |
Holden Hills Phase 2 | Stratus Properties Inc | Tecoma Improvements |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Partnership Contribution |  |  |  | $ 8,800,000 |  |  |  |  |
Holden Hills Phase 2 | Unrelated Equity Investor |  |  |  |  |  |  |  |  |
Limited Partnerships [Line Items] |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  | 50.00% |  | 50.00% |  |  |
Proceeds from Partnership Contribution |  |  |  | $ 47,800,000 |  |  |  |  |

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