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Goodwill and Intangible Assets, net - Schedule of Changes in Net Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Balances, January 1 $ 51,613 $ 49,777
Additions from business acquisitions 20,272  
Foreign currency translation (2,227) 1,836
Balances, December 31 $ 69,658 $ 51,613