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Equity Investment - Schedule of Summarized Financial Information of Unaudited Financial Statements (Detail) - USD ($)
$ 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
Schedule of Equity Method Investments [Line Items]                      
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
Current assets 121,129       136,118       121,129 136,118  
Current liabilities 136,647       147,931       136,647 147,931  
Ciner Wyoming                      
Schedule of Equity Method Investments [Line Items]                      
Income allocation to NRP’s equity interests                 54,709 47,354 37,036
Amortization of basis difference                 (4,791) (5,938) (2,850)
Equity in earnings of unconsolidated investment                 49,918 41,416 34,186
Sales                 486,393 465,032 442,132
Gross profit                 131,493 118,439 94,299
Net income (loss)                 111,650 96,640 $ 79,655
Current assets 144,695       179,851       144,695 179,851  
Noncurrent assets 233,845       223,053       233,845 223,053  
Current liabilities 43,018       47,704       43,018 47,704  
Noncurrent liabilities $ 116,808       $ 149,192       $ 116,808 $ 149,192