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Roll Forward of Fair Value of Contingent Consideration (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance at December 31, 2014 $ 3,844
Payments (1,139)
Changes in fair value 2,114
Balance at September 30, 2015 $ 4,819