Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Income Taxes
Unrecognized tax benefits	$ 2,700		$ 2,700
Unrecognized tax benefits would impact the effective tax rate	2,600		2,600
Interest accrued	200		$ 200
Effective tax rate from operations			43.10%	35.00%
Provision for income taxes	1,509	$ 7,220	$ 3,069	$ 6,710
Effective U.S corporate tax rate			21.00%			35.00%
Provision for transition tax					$ 37,200	$ 40,300
Measurement period adjustment to reduce transition tax					$ (3,100)
Transition tax, unpaid	28,900		$ 28,900
Transition Tax over an eight-year period beginning			2018
Retained earnings	587,533		$ 587,533				$ 583,489
Undistributed foreign earnings	231,200		231,200
Other Long-term Liabilities
Income Taxes
Transition tax, unpaid	25,100		25,100
Accounts Payable, Accrued Expenses and Operating Lease Liabilities
Income Taxes
Transition tax, unpaid	3,800		3,800
U.S
Income Taxes
Cash and cash equivalents and short-term investments	228,100		$ 228,100				289,400
U.S | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
Italy | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
Poland | Earliest Tax Year
Income Taxes
Tax years subject to examination			2015
Spain | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
United Kingdom | Earliest Tax Year
Income Taxes
Tax years subject to examination			2018
Germany | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
Foreign
Income Taxes
Cash and cash equivalents and short-term investments	$ 302,800		$ 302,800				276,200
Retained earnings							$ 431,200