XML 121 R105.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Employee Benefit Plans (Pension Benefit Plan) - Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Retirement Benefits [Abstract] |  |
Net actuarial loss | $ (1,824) | $ (3,231)

X
- Definition Defined benefit plan accumulated other comprehensive income net actuarial gains losses net of tax. + References No definition available. + Details
Name: | adtn_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetActuarialGainsLossesNetOfTax
Namespace Prefix: | adtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration