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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