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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Long-term debt including current maturities $ 108,600,000  
Fair value of long-term debt 128,800,000 133,200,000
Total Long-term debt $ 115,670,000 $ 110,103,000