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Rollforward of Fair Value of Contingent Consideration (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance at December 31, 2015 $ 6,788
Additions 928
Payments (4,781)
Foreign currency translation adjustments 9
Changes in fair value 3,317
Balance at September 30, 2016 $ 6,261