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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 578,924 | $ 425,189
Less accumulated depreciation, depletion and amortization | 162,123 | 143,318
Property, plant and equipment, net | 416,801 | 281,871
Machinery, equipment and automotive [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 319,088 | 253,317
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 | 48,379 | 44,248
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 | 6,933 | 6,718
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] |  |
Property, plant and equipment, gross | 1,672 | 1,468
Useful lives in years | 10 years |
Land improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 6,214 | 1,148
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 | 66,764 | 49,801
Construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 110,376 | 52,673
Capital spare parts [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 9,718 | 5,430
Land [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 9,780 | $ 10,386

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- 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 -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 + Details
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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 + Details
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- Definition 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 + Details
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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 No definition available. + Details
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