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Segment Information - Sales Information by Category (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenue from External Customer [Line Items] |  |  |  |
Sales | $ 185,112 | $ 168,890 | $ 540,064 | $ 473,795
Access & Aggregation [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | 135,959 | 120,618 | 394,741 | 316,705
Customer Devices [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | 35,582 | 32,984 | 105,683 | 106,213
Traditional & Other Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Sales | $ 13,571 | $ 15,288 | $ 39,640 | $ 50,877

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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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