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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2018 | Mar. 19, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 7,100 | $ 3,500 |
Bargain purchase gain net of income taxes |  |  |  | 11,322 |  | $ 3,542
Acquisition and integration related expenses and amortization of acquired intangibles |  |  |  | $ 2,900 |  |
SmartRG Inc [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date of acquisition |  |  |  | Nov. 30, 2018 |  |
Business acquisition, description |  |  |  | On November 30, 2018, we acquired SmartRG, Inc., a provider of carrier-class, open-source connected home platforms and cloud services for broadband service providers for cash consideration. Together, ADTRAN Mosaic and SmartOS provide full end-to-end management and orchestration solutions from cloud edge to subscriber edge. This transaction was accounted for as a business combination. We have included the financial results of this acquisition in our consolidated financial statements since the date of acquisition. These revenues are included in the Subscriber Solutions & Experience category within the Network Solutions and Services & Support reportable segments. As of the acquisition date, we acquired accounts receivables with a fair value of $4.9 million all of which we estimate will be collected under the respective terms of each agreement. |  |
Acquired Accounts Receivables | $ 4,900 |  |  |  |  |
Business combination, contingent consideration, liability | 1,200 |  |  | $ 1,200 |  |
Minimum potential payment under contingent liability | 0 |  |  |  |  |
Maximum potential payment under contingent liability | 1,500 |  |  |  |  |
Change in fair value |  |  |  | 0 |  |
Business combination escrow amount | 2,800 |  |  |  |  |
Goodwill |  |  |  | $ 3,600 |  |
SmartRG Inc [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination potential release of funds | 0 |  |  |  |  |
SmartRG Inc [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination potential release of funds | $ 2,800 |  |  |  |  |
Sumitomo [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Date of acquisition |  |  |  | Mar. 19, 2018 |  |
Business acquisition, description |  |  |  | On March 19, 2018, we acquired Sumitomo Electric Lightwave Corp.’s (SEL) North American EPON business and entered into a technology license and OEM supply agreement with Sumitomo Electric Industries, Ltd. (SEI). This acquisition establishes ADTRAN as a North American market leader for EPON solutions for the cable MSO industry and it will accelerate the MSO market’s adoption of our open, programmable and scalable architectures. |  |
Bargain purchase gain net of income taxes |  | $ 11,322 | $ 11,300 |  |  |

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