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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Finite-lived intangible assets    
Gross Carrying Amount $ 26,499 $ 21,256
Accumulated Amortization (9,950) (9,469)
Indefinite-lived intangible assets    
Goodwill 19,181 13,873
Patents [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 4,826 4,824
Accumulated Amortization (4,510) (4,434)
Land Use Rights [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,356 1,380
Accumulated Amortization (155) (153)
Trademark [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 2,032 1,590
Accumulated Amortization (734) (680)
Customer Backlog [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 605 578
Accumulated Amortization (605) (578)
Technology [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 3,749 2,751
Accumulated Amortization (614) (538)
Customer Relationships [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 13,931 10,133
Accumulated Amortization $ (3,332) $ (3,086)