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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	May 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2018
Income Taxes
Unrecognized tax benefits		$ 5,100		$ 5,100
Unrecognized tax benefits would impact the effective tax rate		4,500		4,500
Unrecognized tax benefits expected to decrease in the next 12 months due to expiration of applicable statute of limitation		2,200		2,200
Interest accrued		800		$ 800
Effective tax rate from operations				35.00%	7.70%
Provision for income taxes		7,220	$ 1,059	$ 6,710	$ 541
Effective U.S corporate tax rate				21.00%		35.00%
Provision for transition tax							$ 37,200
Transition tax paid							8,300
Transition tax		28,900		$ 28,900
Transition tax last payment, year				2025
Retained earnings		561,622		$ 561,622			549,134
Minimum
Income Taxes
Undistributed foreign earnings		197,400		197,400
Other Long-term Liabilities
Income Taxes
Transition tax		28,000		28,000
Accounts Payable, Accrued Expenses and Operating Lease Liabilities
Income Taxes
Transition tax		900		900
Voice.com Domain Name
Income Taxes
Provision for income taxes	$ 8,100
Net gain on sale of domain name	$ 29,800
U.S
Income Taxes
Cash and cash equivalents and short-term investments		294,000		$ 294,000			173,600
U.S | Earliest Tax Year
Income Taxes
Tax years subject to examination				2014
Italy | Earliest Tax Year
Income Taxes
Tax years subject to examination				2013
Poland | Earliest Tax Year
Income Taxes
Tax years subject to examination				2014
Spain | Earliest Tax Year
Income Taxes
Tax years subject to examination				2015
United Kingdom | Earliest Tax Year
Income Taxes
Tax years subject to examination				2016
Germany | Earliest Tax Year
Income Taxes
Tax years subject to examination				2016
Foreign
Income Taxes
Cash and cash equivalents and short-term investments		$ 280,800		$ 280,800			402,500
Retained earnings							$ 397,400
Offshore receipts in respect of intangible property legislation tax payments percentage				20.00%

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