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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 19, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |
Bargain purchase gain net of income taxes |  |  |  | $ 11,322
Sumitomo Electric Lightwave Corp.'s North American EPON Business [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 the 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 |
Acquisition and integration related expenses and amortization of acquired intangibles |  | $ 700 |  | $ 1,600

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