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Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term debt $ 107,865 $ 72,441
Less current portion of long-term debt 11,718 4,798
Long-term debt due after one year 96,147 67,643
Working Capital Revolver Loan [Member]
   
Debt Instrument [Line Items]    
Long-term debt      
Secured Term Loan [Member]
   
Debt Instrument [Line Items]    
Long-term debt 66,563 68,438
Secured Promissory Note [Member]
   
Debt Instrument [Line Items]    
Long-term debt 32,837  
Other, with a current weighted-average interest rate of 5.48%, most of which is secured by machinery, equipment and real estate [Member]
   
Debt Instrument [Line Items]    
Long-term debt $ 8,465 $ 4,003