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Related Party Transactions - Additional Information (Detail) - USD ($)
shares in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2014
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Related Party Transaction [Line Items]                        
Amount payable to related parties   $ 1,464,000       $ 950,000       $ 1,464,000 $ 950,000  
Lease expenses                   600,000    
Revenues   116,063,000 $ 125,479,000 $ 137,630,000 $ 109,677,000 137,273,000 $ 91,609,000 $ 90,561,000 $ 80,309,000 488,849,000 399,752,000 $ 358,117,000
Unrecouped minimum royalty payments                   82,600,000    
Contracts receivable—affiliate, current and long-term   4,891,000       4,870,000       4,891,000 4,870,000  
Accounts receivable   $ 6,864,000       9,494,000       6,864,000 9,494,000  
Gain on reserve swaps                   $ 9,300,000 5,700,000 8,100,000
Rate of senior notes   9.125%               9.125%    
Deferred revenue—affiliates   $ 82,853,000       87,053,000       $ 82,853,000 87,053,000  
Operating and maintenance expenses—affiliates, net                   16,031,000 10,770,000 8,821,000
Quintana Minerals                        
Related Party Transaction [Line Items]                        
Amount payable to related parties   1,100,000       600,000       1,100,000 600,000  
Western Pocahontas Properties                        
Related Party Transaction [Line Items]                        
Amount payable to related parties   300,000       400,000       $ 300,000 400,000  
Cline Affiliates [Member]                        
Related Party Transaction [Line Items]                        
Rate of interest in the partnerships general partner                   31.00%    
Related party transaction number of units hold by the related party in partnerships' general partner                   500    
Accounts receivable   6,400,000       9,200,000       $ 6,400,000 9,200,000  
Net amount receivable           5,600,000         5,600,000  
Accounts receivable           1,100,000         1,100,000  
Cline Affiliates [Member]                        
Related Party Transaction [Line Items]                        
Net amount receivable   4,900,000               4,900,000    
Accounts receivable   1,500,000               1,500,000    
Foresight Energy Lp [Member] | Affiliated Entity                        
Related Party Transaction [Line Items]                        
Lease receivable, next year   5,000,000               5,000,000    
Deficiency payment   1,250,000               1,250,000    
Foresight Energy Lp [Member] | Coal Sales [Member]                        
Related Party Transaction [Line Items]                        
Revenues                   86,600,000 81,500,000 88,400,000
Sugar Camp [Member]                        
Related Party Transaction [Line Items]                        
Contracts receivable—affiliate, current and long-term   81,200,000       86,300,000       81,200,000 86,300,000  
Unearned income   35,400,000       39,000,000       35,400,000 39,000,000  
Net amount receivable   45,900,000       47,300,000       45,900,000 47,300,000  
Accounts receivable   2,000,000       1,800,000       2,000,000 1,800,000  
Sugar Camp [Member] | Affiliated Entity                        
Related Party Transaction [Line Items]                        
Lease receivable, year two   5,000,000               5,000,000    
Lease receivable, year three   5,000,000               5,000,000    
Lease receivable, year four   5,000,000               5,000,000    
Lease receivable, year five   5,000,000               5,000,000    
Corsa [Member]                        
Related Party Transaction [Line Items]                        
Accounts receivable   200,000       300,000       200,000 300,000  
Royalty Revenue from Coal                   3,100,000 3,000,000 4,600,000
Deferred revenue—affiliates   300,000               300,000    
Forge Group [Member]                        
Related Party Transaction [Line Items]                        
Coal, hard mineral royalty and other—affiliates                       1,800,000
Western Pocahontas Properties Limited Partnership [Member] | Affiliated Entity                        
Related Party Transaction [Line Items]                        
Operating and maintenance expenses—affiliates, net                   400,000 0 $ 0
Other assets—affiliate   $ 1,100,000       0       $ 1,100,000 0  
Senior Notes Due Two Zero One Eight [Member] | Cline Trust Company [Member]                        
Related Party Transaction [Line Items]                        
Partnership common units owned   540               540    
Principal amount of partnership purchased $ 20,000,000                 $ 20,000,000    
Rate of senior notes 9.125% 9.125%               9.125%    
Aggregate principal amount of senior notes $ 125,000,000                      
Senior notes due   $ 19,900,000       $ 19,900,000       $ 19,900,000 $ 19,900,000