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Goodwill and Other Intangibles - Finite and Indefinite-Lived Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Finite-lived intangible assets    
Gross Carrying Amount $ 26,873 $ 21,256
Accumulated Amortization (10,379) (9,469)
Indefinite-lived intangible assets    
Goodwill 19,384 13,873
Patents [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 4,826 4,824
Accumulated Amortization (4,583) (4,434)
Land Use Rights [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,369 1,380
Accumulated Amortization (164) (153)
Trademark [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 2,068 1,590
Accumulated Amortization (782) (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 3,826 2,751
Accumulated Amortization (680) (538)
Customer Relationships [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 14,179 10,133
Accumulated Amortization $ (3,565) $ (3,086)