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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,200,207	$ 736,610
Less accumulated depreciation, depletion and amortization	221,498	148,486
Property, plant and equipment, net	978,709	588,124
Machinery, Equipment and Automotive [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 540,315	311,920
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	$ 76,277	72,529
Buildings and Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 40,372	34,022
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]
Property, plant and equipment, gross	$ 2,409	2,294
Furniture, Fixtures and Store Equipment [Member] | Minimum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	3 years
Furniture, Fixtures and Store Equipment [Member] | Maximum [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	10 years
Assets Under Capital Leases [Member]
Property Plant And Equipment [Line Items]
Useful lives in years	3 years
Property, plant and equipment, gross	$ 425	240
Land Improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 7,183	6,875
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	$ 506,205	291,034
Capital Spare Parts [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	18,047	8,722
Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 8,974	$ 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)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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