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Alabama State Industrial Development Authority Financing and Economic Incentives - Additional Information (Detail) - USD ($) $ in Thousands		9 Months Ended
	Jan. 02, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2008
Debt Instrument [Line Items]
Repayment of bond			$ 24,600
Taxable Revenue Bonds [Member]
Debt Instrument [Line Items]
Proceeds from state industrial development authority issued taxable bonds loaned to ADTRAN				$ 50,000
Percentage of interest on bond		2.00%
Maturity date of bond		Jan. 01, 2020
Repayment of bond	$ 24,600
Taxable Municipal Bonds Issued In January 1995 [Member]
Debt Instrument [Line Items]
Proceeds from state industrial development authority issued taxable bonds loaned to ADTRAN		$ 20,000

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