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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information [Line Items] |  |  |  |  |
Measurement period adjustment to reduce transition tax |  | $ 3,100 |  | $ 3,100 |
Provision for income taxes |  |  | $ 3,908 | $ (2,019) | $ 53,279
Voice.com Domain Name |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |
Provision for income taxes | $ 8,100 |  | 8,100 |  |
Voice.com Domain Name | Other Income, Net |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |
Gain on sale of domain name | $ 29,800 |  | $ 29,800 |  |

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