Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation Of Revenue [Line Items]
Revenue	$ 323,912	$ 154,518
Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	79,336	56,722
Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	96,820	97,796
Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	147,756
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	282,418	138,374
Network Solutions [Member] | Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	70,287	52,390
Network Solutions [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	84,554	85,984
Network Solutions [Member] | Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	127,577
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue	41,494	16,144
Services & Support [Member] | Subscriber Solutions
Disaggregation Of Revenue [Line Items]
Revenue	9,049	4,332
Services & Support [Member] | Access & Aggregation Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue	12,266	$ 11,812
Services & Support [Member] | Optical Networking Solutions
Disaggregation Of Revenue [Line Items]
Revenue	$ 20,179