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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,281,567	$ 1,346,499
Less accumulated depreciation, depletion and amortization	267,529	267,541
Property, plant and equipment, net	1,014,038	1,078,958
Machinery, Equipment and Automotive [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,163,532	1,159,001
Machinery, Equipment and Automotive [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	2 years
Machinery, Equipment and Automotive [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	30 years
Proved Natural Gas Properties [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross		76,679
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 42,886	40,810
Buildings and Improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	10 years
Buildings and Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	30 years
Furniture, Fixtures and Store Equipment [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	4 years
Property, plant and equipment, gross	$ 1,466	1,661
Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 8,111	8,083
Land Improvements [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	10 years
Land Improvements [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	40 years
Construction in Progress [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 27,973	25,640
Capital Spare Parts [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	29,835	25,655
Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 7,764	$ 8,970

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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