Sale of Domain Name - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	May 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Nonoperating Income And Expense [Line Items]
Provision for income taxes		$ 1,509,000	$ 7,220,000	$ 3,069,000	$ 6,710,000
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
Voice.com Domain Name | Other Income, Net
Other Nonoperating Income And Expense [Line Items]
Gain on sale of domain name			$ 29,800,000