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Fair Value Measurements - Schedule of Fair Values of Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financial assets:    
Cash equivalents $ 123,027 $ 55,634
Derivative financial instruments 3,003 618
Total financial assets 126,030 56,252
Financial liabilities:    
Contingent consideration 4,485 1,834
Level 1 [Member]    
Financial assets:    
Cash equivalents 123,027 55,634
Total financial assets 123,027 55,634
Level 2 [Member]    
Financial assets:    
Derivative financial instruments 3,003 618
Total financial assets 3,003 618
Level 3 [Member]    
Financial liabilities:    
Contingent consideration $ 4,485 $ 1,834