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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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