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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Finite-lived intangible assets    
Gross Carrying Amount $ 24,988 $ 20,678
Accumulated Amortization (9,979) (8,891)
Indefinite-lived intangible assets    
Goodwill 18,359 13,873
Patents [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 4,825 4,824
Accumulated Amortization (4,657) (4,434)
Land Use Rights [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,302 1,380
Accumulated Amortization (164) (153)
Trademark [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,931 1,590
Accumulated Amortization (782) (680)
Technology [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 3,501 2,751
Accumulated Amortization (689) (538)
Customer Relationships [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 13,429 10,133
Accumulated Amortization $ (3,687) $ (3,086)