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Segment Information - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) Segment Person | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of operating segments | Segment | 3 |  |
Number of reportable segments | Segment | 2 |  |
Cost of sales | $ 608,073 | $ 613,372 | $ 563,122
Number of persons employed by Chemical Business | Person | 576 |  |
Number of persons represented by unions under agreements | Person | 197 |  |
Chemical [Member] | 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 |  |

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62136-109447 + Details
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