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Restructuring - Schedule of Components of Restructuring Expenses Including in Condensed Consolidated Statements of (Loss) Income (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses $ 5,936,000 $ 24,873,000 $ 40,576,000 $ 33,178,000
Cost of Sales [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 7,000 21,630,000 14,042,000 21,706,000
Cost of Sales [Member] | Network Solutions [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 517,000 611,000 3,359,000 669,000
Cost of Sales [Member] | Services & Support [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses (182,000) (24,000) 2,086,000 (6,000)
Other (Credits), Charges and Inventory Write-Down [Member] | Network Solutions [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses (328,000) 21,043,000 8,597,000 21,043,000
Selling, General and Administrative Expenses [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses 2,681,000 3,387,000 7,980,000 6,960,000
Research and Development Expenses [Member]        
Restructuring Cost And Reserve [Line Items]        
Total restructuring expenses $ 3,248,000 $ (144,000) $ 18,554,000 $ 4,512,000