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Segment Information - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) Segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of reportable segment | Segment | 1 |  |
Cost of sales | $ 417,647 | $ 430,423 | $ 369,387
Customer [Member] | Net Sales [Member] | Covestro [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of total net sales | 15.00% | 14.00% | 15.00%
Customer [Member] | Net Sales [Member] | Koch Nitrogen [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of total net sales | 12.00% | 7.00% | 7.00%
Natural Gas Properties |  |  |
Segment Reporting Information [Line Items] |  |  |
Net loss | $ 42,800 |  |
Net sales | 3,400 |  |
Cost of sales | 6,300 |  |
Depreciation, depletion and amortization | 5,200 |  |
Production costs | 1,100 |  |
Selling, general and administrative expense | 200 |  |
Non-cash impairment charge | 39,700 |  |
Other Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 12,900 | $ 24,500 | $ 21,700

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