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Goodwill and Other Intangibles - Schedule of Goodwill (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Balance at December 31, 2017 $ 23,844
Additions for acquisitions 6,250
Divestiture adjustment (135)
Effects of currency exchange (155)
Balance at September 30, 2018 $ 29,804