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Investment Partnerships - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]      
Total assets $ 863,579   $ 866,133
Total liabilities $ 274,293   293,172
Lion Fund      
Schedule of Equity Method Investments [Line Items]      
Biglari Holdings' ownership interest 91.60% 90.20%  
Lion Fund II      
Schedule of Equity Method Investments [Line Items]      
Biglari Holdings' ownership interest 87.80% 87.30%  
Lion Fund      
Schedule of Equity Method Investments [Line Items]      
Total assets $ 623,894   567,387
Total liabilities 15,173   20,609
Total revenues 58,537 $ 33,316  
Total earnings 57,970 32,417  
Lion Fund II      
Schedule of Equity Method Investments [Line Items]      
Total assets 365,151   367,630
Total liabilities 178,988   $ 188,202
Total revenues 23,257 (42,355)  
Total earnings $ 18,396 $ (48,207)