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Segment Information and Major Customers - Sales Information by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Sales	$ 126,836	$ 185,112	$ 184,673	$ 170,279	$ 162,986	$ 168,890	$ 162,701	$ 142,204	$ 666,900	$ 636,781	$ 600,064
Access & Aggregation [Member]
Revenue from External Customer [Line Items]
Sales									473,943	436,372	405,698
Customer Devices [Member]
Revenue from External Customer [Line Items]
Sales									138,456	137,608	125,565
Traditional & Other Products [Member]
Revenue from External Customer [Line Items]
Sales									$ 54,501	$ 62,801	$ 68,801

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+ References

No definition available.

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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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