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Partners' Capital - Incentive Distribution Rights and Distributions of Available Cash (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Limited Partners' Capital Account [Line Items]    
Distribution period 45 days  
Martin Midstream GP LLC    
Limited Partners' Capital Account [Line Items]    
Incentive distribution $ 0 $ 0
Martin Midstream GP LLC | Target Level 2    
Limited Partners' Capital Account [Line Items]    
Target cash distribution, percent 15.00%  
Target cash distribution (USD per share) $ 0.625  
Martin Midstream GP LLC | Target Level 3    
Limited Partners' Capital Account [Line Items]    
Target cash distribution, percent 25.00%  
Target cash distribution (USD per share) $ 0.75  
Martin Midstream GP LLC | Target Level 4    
Limited Partners' Capital Account [Line Items]    
Target cash distribution, percent 50.00%  
Minimum | Martin Midstream GP LLC | Target Level 1    
Limited Partners' Capital Account [Line Items]    
Target cash distribution (USD per share) $ 0.50  
Minimum | Martin Midstream GP LLC | Target Level 2    
Limited Partners' Capital Account [Line Items]    
Target cash distribution (USD per share) 0.55  
Minimum | Martin Midstream GP LLC | Target Level 3    
Limited Partners' Capital Account [Line Items]    
Target cash distribution (USD per share) 0.625  
Minimum | Martin Midstream GP LLC | Target Level 4    
Limited Partners' Capital Account [Line Items]    
Target cash distribution (USD per share) 0.75  
Maximum | Martin Midstream GP LLC | Target Level 1    
Limited Partners' Capital Account [Line Items]    
Target cash distribution (USD per share) $ 0.55  
MMGP LLC    
Limited Partners' Capital Account [Line Items]    
General partner interest percentage 2.00%  
MMGP LLC | Martin Midstream GP LLC    
Limited Partners' Capital Account [Line Items]    
General partner interest percentage 2.00%  
MMGP LLC | Martin Midstream GP LLC | Target Level 1    
Limited Partners' Capital Account [Line Items]    
Target cash distribution, percent 2.00%