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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finite-lived intangible assets    
Gross Carrying Amount $ 27,379 $ 22,445
Accumulated Amortization (14,520) (13,987)
Indefinite-lived intangible assets Goodwill 28,726 15,621
Patents [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 4,806 4,806
Accumulated Amortization (4,806) (4,788)
Land Use Rights [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 1,134 1,134
Accumulated Amortization (203) (203)
Trademarks [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 1,712 1,707
Accumulated Amortization (1,297) (1,247)
Technology [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 5,387 2,994
Accumulated Amortization (1,439) (1,334)
Customer Relationships [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 14,340 11,804
Accumulated Amortization $ (6,775) $ (6,415)