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Financial Instruments that Required Fair Value Disclosure (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying value $ 7,030 $ 10,081 $ 8,533 $ 13,919
Accounts receivable, net, Carrying value 17,212 14,246    
Accounts payable, Carrying value 5,201 6,203    
Long-term debt (including current maturities), Carrying value 22,515 24,185    
Carrying amount [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Carrying value 7,030 10,081    
Accounts receivable, net, Carrying value 17,212 14,246    
Accounts payable, Carrying value 5,201 6,203    
Long-term debt (including current maturities), Carrying value 22,515 24,185    
Fair value [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, Fair value 7,030 10,081    
Accounts receivable, net, Fair value 17,212 14,246    
Accounts payable, Fair value 5,201 6,203    
Long-term debt (including current maturities), Fair value $ 22,515 $ 24,185