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Segment Information - Sales and Gross Profit of Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 185,112 | $ 168,890 | $ 540,064 | $ 473,795
Gross Profit | 86,498 | 75,808 | 244,845 | 220,557
Network Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 145,467 | 136,277 | 444,607 | 398,709
Gross Profit | 71,939 | 65,289 | 214,762 | 195,804
Services & Support [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 39,645 | 32,613 | 95,457 | 75,086
Gross Profit | $ 14,559 | $ 10,519 | $ 30,083 | $ 24,753

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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