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Information by Geographic Area (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived Assets $ 16,236   $ 15,826 [1]
Net sales 78,069 73,405  
China
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived Assets 11,643   10,793
United States
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived Assets 3,425   3,762
Net sales 61,383 63,871  
Hong Kong
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived Assets 1,168   1,271
Net sales 1,210 229  
Europe
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 9,068 3,209  
Canada
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 2,090 2,779  
Other
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 4,318 $ 3,317  
[1] Derived from audited financial statements