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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Contingencies And Commitments [Line Items]
Commitments related to performance bonds	$ 21.1	$ 22.9
Commitments related to performance bonds expiration month and year	2025-04
Purchase commitments	$ 454.1
Commitments towards private equity funds	4.9
Investment Commitments [Member]
Contingencies And Commitments [Line Items]
Aggregate investment committed in private equity funds	$ 5.0

X

- Definition

Commitments related to performance bonds.

+ References

No definition available.

+ Details

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Namespace Prefix:	adtn_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Commitments related to performance bonds expiration month and year.

+ References

No definition available.

+ Details

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Namespace Prefix:	adtn_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contributions made that have been applied to private equity fund commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	adtn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Contingencies and commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	adtn_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Cost of the investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: