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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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