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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Finite-lived intangible assets    
Gross Carrying Amount $ 31,595 $ 31,962
Accumulated Amortization (18,656) (17,519)
Indefinite-lived intangible assets Goodwill 28,695 29,508
Patents [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 4,813 4,806
Accumulated Amortization (4,806) (4,806)
Land Use Rights [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 1,324 1,286
Accumulated Amortization (451) (396)
Trademarks [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 1,857 1,756
Accumulated Amortization (1,528) (1,474)
Technology [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 7,453 7,673
Accumulated Amortization (2,749) (2,402)
Customer Relationships [Member]    
Finite-lived intangible assets    
Gross Carrying Amount 16,148 16,441
Accumulated Amortization $ (9,122) $ (8,441)