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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) (USD $) In Thousands, unless otherwise specified |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Buildings and improvements | Dec. 31, 2012 Buildings and improvements | Dec. 31, 2013 Buildings and improvements Minimum | Dec. 31, 2013 Buildings and improvements Maximum | Dec. 31, 2013 Office equipment and furniture | Dec. 31, 2012 Office equipment and furniture | Dec. 31, 2013 Office equipment and furniture Minimum | Dec. 31, 2013 Office equipment and furniture Maximum | Dec. 31, 2013 Automobiles and trucks | Dec. 31, 2012 Automobiles and trucks | Dec. 31, 2013 Automobiles and trucks Minimum | Dec. 31, 2013 Automobiles and trucks Maximum | Dec. 31, 2013 Machinery and shop equipment | Dec. 31, 2012 Machinery and shop equipment | Dec. 31, 2013 Machinery and shop equipment Minimum | Dec. 31, 2013 Machinery and shop equipment Maximum | Dec. 31, 2013 Construction in Progress | Dec. 31, 2012 Construction in Progress
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, Estimated Useful Lives (years) |  |  |  |  | 15 years | 25 years |  |  | 2 years | 7 years |  |  | 2 years | 5 years |  |  | 2 years | 10 years |  |
Property, plant and equipment, gross | $ 13,828 | $ 12,233 | $ 3,756 | $ 4,426 |  |  | $ 2,476 | $ 1,766 |  |  | $ 226 | $ 219 |  |  | $ 4,895 | $ 4,523 |  |  | $ 2,475 | $ 1,299
Less: accumulated depreciation and amortization | 8,026 | 7,660 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment gross, excluding land | 5,802 | 4,573 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Land | 238 | 349 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net | $ 6,040 | $ 4,922 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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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