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Fair Value Measurement - Schedule of Changes in Estimated Fair Value of Contingent Consideration Liability (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Fair value as of December 31, 2013 $ 1,570
Change in fair value 130
Fair value as of September 30, 2014 $ 1,700