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Segment Information and Major Customers - Sales and Gross Profit of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Sales	$ 115,787	$ 114,092	$ 156,391	$ 143,791	$ 140,088	$ 140,335	$ 128,048	$ 120,806	$ 530,061	$ 529,277	$ 666,900
Gross Profit	$ 47,209	$ 46,331	$ 65,015	$ 60,612	$ 55,388	$ 58,448	$ 49,996	$ 39,733	219,167	203,565	303,635
Network Solutions [Member]
Segment Reporting Information [Line Items]
Sales									455,226	458,232	540,396
Gross Profit									191,549	179,303	260,833
Services & Support [Member]
Segment Reporting Information [Line Items]
Sales									74,835	71,045	126,504
Gross Profit									$ 27,618	$ 24,262	$ 42,802

X

- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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