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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Finite-lived intangible assets    
Gross Carrying Amount $ 21,186 $ 22,045
Accumulated Amortization (8,739) (8,007)
Indefinite-lived intangible assets    
Goodwill 14,608 15,537
Patents [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 4,821 4,819
Accumulated Amortization (4,285) (4,135)
Land Use Rights [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,291 1,322
Accumulated Amortization (134) (125)
Trademark [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,578 1,674
Accumulated Amortization (598) (529)
Customer backlog [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 578 578
Accumulated Amortization (578) (578)
Technology [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 2,723 2,924
Accumulated Amortization (454) (361)
Customer Relationships [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 10,195 10,728
Accumulated Amortization $ (2,690) $ (2,279)