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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 140,088	$ 140,335	$ 128,048	$ 120,806	$ 126,836	$ 185,112	$ 184,673	$ 170,279	$ 529,277	$ 666,900	$ 636,781
Gross Profit	$ 55,388	$ 58,448	$ 49,996	$ 39,733	$ 58,809	$ 86,491	$ 84,626	$ 73,709	203,565	303,635	291,330
Network Solutions [Member]
Segment Reporting Information [Line Items]
Sales									458,232	540,396	525,502
Gross Profit									179,303	260,833	254,797
Services & Support [Member]
Segment Reporting Information [Line Items]
Sales									71,045	126,504	111,279
Gross Profit									$ 24,262	$ 42,802	$ 36,533

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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