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Inventory - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 09, 2024 | Jun. 30, 2024 | Jun. 30, 2024
Inventory [Line Items] |  |  |
Strategy shift charges | $ 2,000 |  |
Inventory write down |  |  | $ 4,135
Business Efficiency Program |  |  |
Inventory [Line Items] |  |  |
Strategy shift charges |  | $ 100 | 8,900
Inventory write down |  | 100 | 4,100
Other charges |  | $ 0 | $ 4,800

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- Definition Other charges. + References No definition available. + Details
Name: | adtn_OtherCharges
Namespace Prefix: | adtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Strategy shift charges. + References No definition available. + Details
Name: | adtn_StrategyShiftCharges
Namespace Prefix: | adtn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 330 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483080/330-10-50-2 + Details
Name: | us-gaap_InventoryWriteDown
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=adtn_BusinessEfficiencyProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |