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Business Segment, Geographic Area, Product and Significant Customer Information - Company Long-Lived Assets in Different Geographic Regions (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues $ 166,453 $ 141,447 $ 465,026 $ 509,712  
Long-lived assets 79,977   79,977   82,711
United States [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 91,286 73,775 252,704 259,954  
Long-lived assets 61,404   61,404   62,203
Korea [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 16,491 12,574 46,597 54,472  
Japan [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 13,825 14,270 40,243 67,122  
Europe [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 20,433 21,341 57,958 65,800  
Long-lived assets 5,175   5,175   5,844
Asia (excluding Korea and Japan) [Member]
          
Revenues from External Customers and Long-Lived Assets [Line Items]          
Net revenues 24,418 19,487 67,524 62,364  
Long-lived assets $ 13,398   $ 13,398   $ 14,664