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ORGANIZATION AND PRESENTATION (Details)
12 Months Ended
Jun. 16, 2014
shares
Apr. 26, 2007
May. 15, 2006
$ / item
shares
Dec. 31, 2015
shares
Ownership interests        
Ownership percentage by limited partners       100.00%
ARLP        
Ownership interests        
Unit split ratio 2      
Units issued due to split 37,030,317      
Additional units issued to parent 15,544,169      
MGP        
Ownership interests        
Subsidiaries holding percentage       100.00%
ARLP        
Ownership interests        
Units owned by parent 31,088,338     31,088,338
ARLP | SGP        
Ownership interests        
Ownership percentage by noncontrolling owners       0.01%
Intermediate Partnership | SGP        
Ownership interests        
Ownership percentage by noncontrolling owners       0.01%
Alliance Coal        
Ownership interests        
Subsidiaries holding percentage       0.001%
IPO Concurrent Transactions | MGP        
Ownership interests        
Subsidiaries holding percentage     100.00%  
IPO Concurrent Transactions | ARLP        
Ownership interests        
Units owned by parent     15,550,628  
IPO Concurrent Transactions | Alliance Coal        
Ownership interests        
Subsidiaries holding percentage   0.001% 0.001%  
Managing general partner of the subsidiary   MGP AHGP  
Limited Partners' Capital        
Ownership interests        
Partnership units sold     12,500,000  
Price of partnership units sold (in dollars per unit) | $ / item     25.00  
Limited Partners' Capital | IPO Concurrent Transactions | SGP        
Ownership interests        
Units distributed to affiliates     20,641,168  
Limited Partners' Capital | IPO Concurrent Transactions | AMH        
Ownership interests        
Units distributed to affiliates     6,863,470  
Limited Partners' Capital | IPO Concurrent Transactions | AMH II        
Ownership interests        
Units distributed to affiliates     19,858,362