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Principal and Interest Payments on Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Debt Instrument [Line Items]  
2013 $ 2,063
2014 5,084 [1]
2015 $ 1,334
[1] Included outstanding revolving line of credit balance based on the Company's obligation to repay the outstanding revolving line of credit balance at the end of the revolving line of credit term.