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Sale of Domain Name - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
May 30, 2019
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Nonoperating Income And Expense [Line Items]          
Provision for income taxes     $ 3,908,000 $ (2,019,000) $ 53,279,000
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        
Provision for income taxes   $ 8,100,000 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 $ 29,800,000