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Alabama State Industrial Development Authority Financing and Economic Incentives - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2008 | Jan. 13, 1995
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from state industrial development authority issued taxable bonds loaned to ADTRAN | $ 25,600 |  |  | $ 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 | $ 25,400 |  |  |  |
Restricted certificate of deposit held | 25,600 | $ 27,800 |  |  |
Total realized economic incentives | 1,400 | 1,500 | $ 1,300 |  |
Payments on long-term debt | 1,100 | 1,100 | $ 1,100 |  |
Bond debt outstanding classified as current liability | 1,000 | $ 1,100 |  |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Estimated fair value of bond | $ 25,400 |  |  |  |

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