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Alabama State Industrial Development Authority Financing and Economic Incentives - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2008	Jan. 13, 1995
Debt Instrument [Line Items]
Proceeds from state industrial development authority issued taxable bonds loaned to ADTRAN	$ 27,800			$ 50,000	$ 20,000
Percentage of interest on amended and restated bond	2.00%
Maturity date of amended and restated bond	Jan. 01, 2020
Estimated fair value of bond	$ 28,100
Restricted certificate of deposit held	27,800	$ 30,000
Total realized economic incentives	1,300	1,300	$ 1,300
Payments on long-term debt	1,100	$ 1,100	$ 16,500
Bond debt outstanding classified as current liability	1,000
Significant Other Observable Inputs (Level 2) [Member]
Debt Instrument [Line Items]
Estimated fair value of bond	$ 28,100

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