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Business Combinations - Summary of Actual Revenue and Net Loss Included in Consolidated Statements of Income (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Sumitomo Electric Lightwave Corp.'s North American EPON Business [Member]
Business Acquisition [Line Items]
Net loss	$ (77)

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_BusinessAcquisitionAxis=adtn_SumitomoElectricLightwaveCorpSNorthAmericanEPONBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: