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Goodwill and Intangible Assets - Change in the Carrying Value of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Balance, Beginning Balance $ 64,614 $ 61,044
Adjustments (585) 323
Goodwill from distributor acquisitions   3,247
Balance, Ending Balance $ 64,029 $ 64,614