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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
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