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Segment and Geographic Information - Information About the Company's Segments (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting Information [Line Items] |  |  |
Product revenue | $ 295,588 | $ 297,310 | $ 263,463
Service revenue | 28,691 | 24,604 | 27,228
Depreciation and amortization | 10,858 | 9,756 | 9,809
Goodwill and intangibles | 96,459 | 100,939 | 105,334
Operating income | 83,407 | 85,355 | 75,713
MVSD [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenue | 263,308 | 264,956 | 234,052
Service revenue | 10,388 | 8,717 | 13,362
Depreciation and amortization | 9,505 | 8,445 | 8,683
Goodwill and intangibles | 90,390 | 94,322 | 98,252
Operating income | 89,378 | 94,201 | 88,342
SISD [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Product revenue | 32,280 | 32,354 | 29,411
Service revenue | 18,303 | 15,887 | 13,866
Depreciation and amortization | 963 | 908 | 757
Goodwill and intangibles | 6,069 | 6,617 | 7,082
Operating income | 11,941 | 10,301 | 5,064
Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 390 | 403 | 369
Operating income | $ (17,912) | $ (19,147) | $ (17,693)

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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