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Goodwill and Intangible Assets - Goodwill / Tradename (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Goodwill, beginning balance $ 152,156 $ 166,951
Goodwill, divestitures   (14,317)
Goodwill, foreign currency translation (187) (478)
Goodwill, ending balance 151,969 152,156
Tradename, beginning balance 18,258 19,691
Tradename, transfers to finite life classification 3,904  
Tradename, divestitures   (1,340)
Tradename, foreign currency translation (74) (93)
Tradename, ending balance $ 14,280 $ 18,258