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Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022	Jul. 15, 2022
Goodwill [Line Items]
Goodwill	$ 339,083	$ 339,083	$ 381,724
Impairment of goodwill	37,874	37,874
Services & Support [Member]
Goodwill [Line Items]
Goodwill	44,676	$ 44,676	$ 83,444
Impairment of goodwill	$ 37,900
Adtran Networks SE [Member]
Goodwill [Line Items]
Goodwill				$ 350,500

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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