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Alabama State Industrial Development Authority Financing and Economic Incentives - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jan. 02, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2008	Jan. 13, 1995
Debt Instrument [Line Items]
Proceeds from state industrial development authority issued taxable bonds loaned to ADTRAN		$ 24,600
Estimated fair value of bond		24,600
Total realized economic incentives		1,200	$ 1,400	$ 1,500
Payments on long-term debt		1,000	$ 1,100	$ 1,100
Taxable Revenue Bonds [Member]
Debt Instrument [Line Items]
Proceeds from state industrial development authority issued taxable bonds loaned to ADTRAN		$ 24,600			$ 50,000	$ 20,000
Repayment of bond	$ 24,600
Percentage of interest on bond		2.00%
Maturity date of bond			Jan. 01, 2020
Estimated fair value of bond		$ 24,600
Certificate of deposit		$ 25,600

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