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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation Of Revenue [Line Items]
Revenue	$ 247,744	$ 226,173
Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	80,410	69,767
Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	89,136	81,312
Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	78,198	75,094
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	202,217	181,273
Network Solutions [Member] | Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	71,748	60,369
Network Solutions [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	75,847	67,777
Network Solutions [Member] | Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	54,622	53,127
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	45,527	44,900
Services & Support [Member] | Subscriber Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	8,662	9,399
Services & Support [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	13,289	13,535
Services & Support [Member] | Optical Networking Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	$ 23,576	$ 21,966

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