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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating Loss Carryforwards      
Income tax expense $ 4,197 $ 5,918 $ 7,927
Cash paid for income taxes 3,356 1,404 2,250
Income taxes payable 1,283 652  
Difference between partnership's tax basis and reported amounts 69,103 124,695  
Martin Transportation Inc      
Operating Loss Carryforwards      
Income tax expense 3,272 5,478 7,431
State      
Operating Loss Carryforwards      
Income taxes payable 931 567  
MTI      
Operating Loss Carryforwards      
Income tax expense 3,272 5,478 7,431
Net operating loss carryforwards 2,546    
Net operating loss carryforwards, subject to expiration 2,445    
Net operating loss carryforwards, not subject to expiration 101    
MTI | Federal      
Operating Loss Carryforwards      
Income taxes refundable 44 29  
MTI | State      
Operating Loss Carryforwards      
Income taxes refundable 352 85  
Texas      
Operating Loss Carryforwards      
State income taxes $ 925 $ 440 $ 496