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Long-term Debt - Additional Information (Detail) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Debt instrument interest rate 1.64%  
Total debt outstanding $ 10,000,000 $ 11,200,000
Current portion of long-term debt $ 1,600,000 $ 1,600,000
LIBOR
   
Debt Instrument [Line Items]    
Debt instrument variable rate 1.25%