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Redeemable Non-controlling Interest - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Redeemable Noncontrolling Interest [Line Items] |  |
Accrued annual recurring compensation to redeemable non-controlling shareholders | $ 9.8 | $ 10.1
Annual recurring compensation paid to redeemable non-controlling shareholders |  | 10.1
DPLTA [Member] |  |
Redeemable Noncontrolling Interest [Line Items] |  |
Accrued annual recurring compensation to redeemable non-controlling shareholders | $ 9.8 | $ 10.1
Adtran Networks [Member] |  |
Redeemable Noncontrolling Interest [Line Items] |  |
Equity ownership percentage | 33.00% | 34.70%

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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