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Capital Lease Obligations - Components of Capital Lease Obligations (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Capital Lease Obligations [Line Items]    
Capital lease for equipment $ 674 $ 1,144
Less: Current portion of capital lease obligations 87 470
Capital lease obligations, less current portion $ 587 $ 674