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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Operating Loss Carryforwards      
Income Tax Expense (Benefit) $ 7,927 $ 3,380 $ 1,736
Cash paid for income taxes 2,250 1,232 416
Income taxes payable 665 385  
Difference between partnership's tax basis and reported amounts 112,841 91,893  
Martin Transportation Inc      
Operating Loss Carryforwards      
Income Tax Expense (Benefit) 7,431 3,080 1,268
State      
Operating Loss Carryforwards      
Income taxes payable 451 304  
MTI      
Operating Loss Carryforwards      
Income Tax Expense (Benefit) 7,431 3,080 1,268
Net operating loss carryforwards 33,169    
Net operating loss carryforwards, subject to expiration 9,001    
Net operating loss carryforwards, not subject to expiration 24,168    
MTI | State      
Operating Loss Carryforwards      
Income taxes refundable 214 81  
MTI | Federal      
Operating Loss Carryforwards      
Income taxes refundable 374 70  
Texas      
Operating Loss Carryforwards      
State income taxes $ 496 $ 300 $ 468