Cost of the investment.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Investment Partnerships - Narrative (Details) - USD ($)	6 Months Ended
Investment Partnerships - Narrative (Details) - USD ($)	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Deferred tax liability related to investment partnerships	$ 31,985,000		$ 20,004,000
Incentive reallocation fee	$ 0	$ 0
Biglari Entities
Schedule of Equity Method Investments [Line Items]
Incentive reallocation fee, percentage	25.00%
Hurdle rate, percentage	6.00%
Investment Partnerships
Schedule of Equity Method Investments [Line Items]
Investment partnerships at cost	$ 471,832,000		$ 452,164,000