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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 |

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