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Commitments and Contingencies - Additional Information (Detail) € / shares in Units, € in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2025 EUR (€) shares | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 EUR (€) shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2025 EUR (€) € / shares shares | Sep. 30, 2025 USD ($) shares | Sep. 30, 2024 EUR (€) shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Commitments And Contingencies Line Items |  |  |  |  |  |  |  |  |  |
Cash compensation per share | € / shares |  |  |  |  | € 17.21 |  |  |  |  |
Recurring cash compensation per share | € / shares |  |  |  |  | € 0.52 |  |  |  |  |
Aggregate exit compensation payments obligation including guaranteed interest | € 322.7 |  |  |  | € 322.7 |  |  |  | $ 378.7 |
Percentage of guaranteed interest rate | 5.00% |  |  |  | 5.00% |  |  |  | 5.00% |
Percentage of guaranteed interest rate plus a variable component | 1.27% |  |  |  | 1.27% |  |  |  | 1.27% |
Annual recurring compensation obligation |  |  |  |  | € 8.5 | $ 10.0 |  |  |  |
Expire date of exit compensation |  |  |  |  | Mar. 16, 2023 | Mar. 16, 2023 |  |  |  |
Accrued annual recurring compensation obligation |  | $ 2.5 |  | $ 2.4 |  | $ 7.5 |  | $ 7.4 |  |
Commitments related to performance bonds |  |  |  |  |  |  |  |  | $ 18.0 | $ 15.7
Commitments related to performance bonds expiration month and year |  |  |  |  | 2029-04 | 2029-04 |  |  |  |
Purchase obligations |  |  |  |  |  |  |  |  | $ 211.2 |
Adtran Networks [Member] |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies Line Items |  |  |  |  |  |  |  |  |  |
Number of shares tendered | shares | 900,000 | 900,000 | 800,000 | 800,000 | 900,000 | 900,000 | 800,000 | 800,000 |  |
Exit compensation payments | € 16.9 | $ 19.9 | € 15.7 | $ 17.4 | € 16.9 | $ 19.9 | € 15.7 | $ 17.4 |  |
Adtran Networks [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies Line Items |  |  |  |  |  |  |  |  |  |
Number of shares tendered | shares | 1,000 | 1,000 |  |  | 1,000 | 1,000 |  |  |  |

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