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Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financial assets:    
Cash equivalents $ 117,688 $ 55,634
Derivative financial instruments 4,370 618
Total financial assets 122,058 56,252
Financial liabilities:    
Derivative financial instruments 271  
Contingent consideration 4,900 1,834
Total financial liabilities 5,171 1,834
Level 1 [Member]    
Financial assets:    
Cash equivalents 117,688 55,634
Total financial assets 117,688 55,634
Level 2 [Member]    
Financial assets:    
Derivative financial instruments 4,370 618
Total financial assets 4,370 618
Financial liabilities:    
Derivative financial instruments 271  
Total financial liabilities 271  
Level 3 [Member]    
Financial liabilities:    
Contingent consideration 4,900 1,834
Total financial liabilities $ 4,900 $ 1,834