Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 813,409us-gaap_PropertyPlantAndEquipmentGross	$ 578,924us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation, depletion and amortization	194,204	162,123
Property, plant and equipment, net	619,205us-gaap_PropertyPlantAndEquipmentNet	416,801us-gaap_PropertyPlantAndEquipmentNet
Machinery, Equipment and Automotive [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	360,222	319,088
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
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	55,975	48,379
Buildings and Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives in years	8 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	6,492	6,933
Furniture, Fixtures and Store Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives in years	5 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]
Property, plant and equipment, gross	240	1,672
Useful lives in years	5 years
Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,125	6,214
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
Proved Natural Gas Properties [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	72,529	66,764
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	292,324	110,376
Capital Spare Parts [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,722	9,718
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,780	$ 9,780

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

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

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 14

-Article 5

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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

Reference 2: 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

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

-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

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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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.

+ References

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