Segment Information - Additional Information (Detail) $ in Thousands	12 Months Ended
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

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities.

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General and administrative costs from oil & gas producing activities.

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Costs related to the impairment of oil and gas properties.

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The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs.

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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.

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Total revenues from oil and gas producing activities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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