Performance Management - Selected American Shares - Selected American Shares |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance Results | ||||||||||||||||||||||||
| Performance Narrative [Text Block] | The bar chart below provides some indication of the risks of investing in the Fund by showing how the Fund’s investment results have varied from year to year. The following table shows how the Fund’s average annual total returns, for the periods indicated, compare with the S&P 500 Index, a broad-based securities market index. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated information on the Fund’s results can be obtained by visiting www.selectedfund.com or by calling 1-800-243-1575.
After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class S shares; after-tax returns for Class D shares will vary.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. | ||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart below provides some indication of the risks of investing in the Fund by showing how the Fund’s investment results have varied from year to year. | ||||||||||||||||||||||||
| Bar Chart [Heading] | Calendar Year Total Returns for Class S Shares | ||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
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| Bar Chart, Year to Date Return | (0.05%) | ||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Mar. 31, 2026 | ||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Highest | ||||||||||||||||||||||||
| Highest Quarterly Return | 19.29% | ||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Lowest | ||||||||||||||||||||||||
| Lowest Quarterly Return | (25.90%) | ||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||
| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. | ||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. | ||||||||||||||||||||||||
| Performance [Table] |
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| Average Annual Return, Caption [Optional Text] | Average Annual Total Returns (For the periods ended December 31, 2025) | ||||||||||||||||||||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns are shown only for Class S shares; after-tax returns for Class D shares will vary. | ||||||||||||||||||||||||
| Performance Availability Website Address [Text] | www.selectedfund.com | ||||||||||||||||||||||||
| Performance Availability Phone [Text] | 1-800-243-1575 |