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Employee Benefit Plans (401(k) Savings Plans) - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Contribution Plan Disclosure [Line Items] |  |  |
Criteria of employer to contribute in employee saving plan | 100% of an employee’s first 3% of contributions and 50% of their next 2% of contributions |  |
Percentage of employer match to employee's contribution | 100.00% |  |
Percentage of employer match to employee's contribution | 50.00% |  |
Upper limit of employer match | 4.00% |  |
Percentage of employee first contribution | 3.00% |  |
Percentage of employee second contribution | 2.00% |  |
Contribution expense and plan administration costs for savings plan | $ 3,500,000 | $ 4,200,000 | $ 4,100,000
Adtran Networks [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Criteria of employer to contribute in employee saving plan | 25% of an employee's first 6% of contributions |  |
Percentage of employer match to employee's contribution | 25.00% |  |
Upper limit of employer match | 1.50% |  |
Percentage of employee first contribution | 6.00% |  |
Vesting period | 5 years |  |
Maximum statutory compensation amount | $ 345,000 |  |
Adtran Networks [Member] | Maximum [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Percent of match | 50.00% |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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