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Segment Information - Sales Information by Category (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenue from External Customer [Line Items] |  |
Sales | $ 120,806 | $ 170,279
Access & Aggregation [Member] |  |
Revenue from External Customer [Line Items] |  |
Sales | 81,680 | 120,143
Customer Devices [Member] |  |
Revenue from External Customer [Line Items] |  |
Sales | 30,101 | 36,268
Traditional & Other Products [Member] |  |
Revenue from External Customer [Line Items] |  |
Sales | $ 9,025 | $ 13,868

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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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