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Segment Information and Major Customers - Sales and Gross Profit of Market Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Sales	$ 162,986	$ 168,890	$ 162,701	$ 142,204	$ 139,013	$ 158,078	$ 160,138	$ 142,835	$ 636,781	$ 600,064	$ 630,007
Gross Profit	$ 70,787	$ 75,808	$ 78,955	$ 65,794	$ 62,439	$ 70,649	$ 68,246	$ 65,563	291,344	266,897	311,327
Network Solutions [Member]
Segment Reporting Information [Line Items]
Sales									525,502	527,422	559,532
Gross Profit									254,807	233,579	271,517
Services & Support [Member]
Segment Reporting Information [Line Items]
Sales									111,279	72,642	70,475
Gross Profit									$ 36,537	$ 33,318	$ 39,810

X

- 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

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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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- 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.

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