Redeemable Non-controlling Interest - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Redeemable Noncontrolling Interest [Line Items] | |||||
| Accrued annual recurring compensation to redeemable non-controlling shareholders | $ 2.1 | $ 2.4 | $ 4.3 | $ 4.8 | |
| DPLTA [Member] | |||||
| Redeemable Noncontrolling Interest [Line Items] | |||||
| Accrued annual recurring compensation to redeemable non-controlling shareholders | $ 2.1 | $ 4.3 | $ 9.3 | ||
| Adtran Networks [Member] | |||||
| Redeemable Noncontrolling Interest [Line Items] | |||||
| Equity ownership percentage | 28.10% | 28.10% | 29.20% | ||