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Fair Value Measurement - Schedule of Changes in Estimated Fair Value of Contingent Consideration Liability (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Fair Value Disclosures [Abstract]  
Fair value as of December 31, 2014 $ 1,800
Change in fair value (1,800)
Fair value as of September 30, 2015 $ 0