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Fair Value of Financial Assets and Liabilities - Fair Value and Carrying Value of Long-Term Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
Long-term debt, Fair Value $ 12,741 $ 9,573
Long-term debt, Carrying Value $ 12,711 $ 9,573