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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,346,499	$ 1,200,207
Less accumulated depreciation, depletion and amortization	267,541	221,498
Property, plant and equipment, net	1,078,958	978,709
Machinery, Equipment and Automotive [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,159,001	540,315
Machinery, Equipment and Automotive [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	3 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	76,277
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 40,810	40,372
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	$ 1,661	2,409
Assets Under Capital Leases [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	3 years
Property, plant and equipment, gross		425
Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 8,083	7,183
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	$ 25,640	506,205
Capital Spare Parts [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	25,655	18,047
Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 8,970	$ 8,974

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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-Section S99
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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

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+ References

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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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