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Redeemable Non-controlling Interest - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Accrued annual recurring compensation to redeemable non-controlling shareholders | $ 2.5 | $ 2.4 | $ 7.5 | $ 7.4 |
Accrued Annual Recurring Compensation Obligation |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Accrued annual recurring compensation to redeemable non-controlling shareholders | $ 2.5 |  | $ 7.5 |  | $ 9.8
Adtran Networks [Member] |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Equity ownership percentage | 31.40% |  | 31.40% |  |

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