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Segment and Geographic Information - Information About Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]      
Product revenue $ 326,786 $ 295,588 $ 297,310
Service revenue 27,100 28,691 24,604
Depreciation and amortization 11,102 10,858 9,756
Goodwill and intangibles 96,412 96,459 100,939
Operating income 86,368 83,407 85,355
Operating Segments [Member] | MVSD [Member]
      
Segment Reporting Information [Line Items]      
Product revenue 298,186 263,308 264,956
Service revenue 9,465 10,388 8,717
Depreciation and amortization 9,569 9,505 8,445
Goodwill and intangibles 90,718 90,390 94,322
Operating income 99,383 89,378 94,201
Operating Segments [Member] | SISD [Member]
      
Segment Reporting Information [Line Items]      
Product revenue 28,600 32,280 32,354
Service revenue 17,635 18,303 15,887
Depreciation and amortization 1,078 963 908
Goodwill and intangibles 5,694 6,069 6,617
Operating income 8,990 11,941 10,301
Reconciling Items [Member]
      
Segment Reporting Information [Line Items]      
Depreciation and amortization 455 390 403
Operating income $ (22,005) $ (17,912) $ (19,147)