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Segment Information - Sales Information by Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	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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+ References

No definition available.

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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

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