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Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-Term Debt $ 105,760 $ 72,441
Less current portion of long-term debt 11,304 4,798
Long-term debt due after one year 94,456 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 67,500 68,438
Secured Promissory Note [Member]
   
Debt Instrument [Line Items]    
Long-Term Debt 34,456   
Other, with current weighted-average interest rate of 6.82%, most of which is secured by machinery, equipment and real estate [Member]
   
Debt Instrument [Line Items]    
Long-Term Debt $ 3,804 $ 4,003