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Supplemental Quarterly Information (Unaudited) - Selected Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
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
Property, Plant and Equipment [Line Items]                      
Total revenues and other income $ 116,063 $ 125,479 $ 137,630 $ 109,677 $ 137,273 $ 91,609 $ 90,561 $ 80,309 $ 488,849 $ 399,752 $ 358,117
Depreciation, depletion and amortization 18,152 26,624 30,660 25,392 30,258 18,621 16,350 14,647 100,828 79,876 64,377
Asset impairment 50,953 626,838 3,803 0 20,585 0 5,624 0 681,594 26,209 734
Income (loss) from operations 2,042 (576,290) 55,920 40,417 31,050 55,027 50,403 52,439 (477,911) 188,919 236,236
Net income (loss) $ (21,786) $ (600,001) $ 32,578 $ 17,489 $ 8,645 $ 36,173 $ 31,407 $ 32,605 $ (571,720) $ 108,830 $ 172,078
Net income per limited partner unit (in dollars per share) $ (1.75) $ (47.90) $ 2.50 $ 1.40 $ 0.70 $ 3.20 $ 2.80 $ 2.90 $ (45.75) $ 9.42 $ 15.39
Weighted average number of common units outstanding (in shares) 12,230 12,230 12,230 12,230 12,145 11,124 11,040 10,985 12,230 11,326 10,958
Goodwill impairment loss $ 5,500                    
Impairment of intangible assets             $ 5,600        
Coal Mineral Rights                      
Property, Plant and Equipment [Line Items]                      
Asset impairment 8,200 $ 247,800 $ 1,500   $ 16,800       $ 257,468 $ 16,793 $ 734
Oil And Gas Mineral Rights                      
Property, Plant and Equipment [Line Items]                      
Asset impairment 31,900 335,700             367,576 0 $ 0
Aggregate Mineral Rights                      
Property, Plant and Equipment [Line Items]                      
Asset impairment         3,000            
Hard Mineral Royalty                      
Property, Plant and Equipment [Line Items]                      
Asset impairment   $ 43,400             $ 43,402 $ 3,013  
Coal Plant                      
Property, Plant and Equipment [Line Items]                      
Asset impairment     $ 2,300   $ 800            
Coal Processing and Transportation Assets, and Obsolete Equipment of Logan Office [Member]                      
Property, Plant and Equipment [Line Items]                      
Asset impairment 4,700                    
VantaCore Partners LP | Obsolete Plant and Equipment                      
Property, Plant and Equipment [Line Items]                      
Asset impairment $ 700