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Sale of Domain Name - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 30, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Other Nonoperating Income And Expense [Line Items] |  |  |  |  |
Provision for income taxes |  | $ 7,220,000 | $ 1,059,000 | $ 6,710,000 | $ 541,000
Voice.com Domain Name |  |  |  |  |
Other Nonoperating Income And Expense [Line Items] |  |  |  |  |
Proceeds from third-party for sale of domain name | $ 30,000,000.0 |  |  |  |
Unamortized cost | 0 |  |  |  |
Gain on sale of domain name | 29,800,000 |  |  |  |
Provision for income taxes | 8,100,000 |  |  |  |
Voice.com Domain Name | Other Income, Net |  |  |  |  |
Other Nonoperating Income And Expense [Line Items] |  |  |  |  |
Gain on sale of domain name | $ 29,800,000 |  |  |  |

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