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Fair Value Measurements - Schedule of Reconciliation For Contingent Consideration Measured At Fair Value Using Significant Unobservable Inputs (Level 3) (Detail) - Fair Value, Inputs, Level 3 [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]    
Contingent consideration at January 1 $ 28,560  
Acquisition date fair value   $ 25,491
Increase in fair value recognized in acquisition-related amortization and remeasurement 5,870 1,109
Payment made (15,000)  
Contingent consideration at June 30 $ 19,430 $ 26,600