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Segment Information - Revenue and Gross Profit of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 143,232	$ 128,715	$ 270,765	$ 243,238
Gross Profit	62,668	53,472	116,269	105,072
Network Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	125,449	111,323	239,258	208,695
Gross Profit	55,435	47,252	104,243	92,998
Services & Support [Member]
Segment Reporting Information [Line Items]
Revenue	17,783	17,392	31,507	34,543
Gross Profit	$ 7,233	$ 6,220	$ 12,026	$ 12,074

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