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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Taxes
Unrecognized tax benefits	$ 4,100		$ 4,100
Unrecognized tax benefits would impact the effective tax rate	3,600		3,600
Interest accrued	700		$ 700
Effective tax rate from operations			7.70%	21.40%
(Benefit from) provision for income taxes	1,059	$ 2,668	$ 541	$ 6,927
Effective U.S corporate tax rate			21.00%		35.00%
Transition tax					$ 40,300
Other Long-term Liabilities
Income Taxes
Transition tax	32,500		$ 32,500		36,800
U.S
Income Taxes
Cash and cash equivalents and short-term investments	300,100		$ 300,100		293,800
U.S | Earliest Tax Year
Income Taxes
Tax years subject to examination			2014
Germany | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
Poland | Earliest Tax Year
Income Taxes
Tax years subject to examination			2013
China | Earliest Tax Year
Income Taxes
Tax years subject to examination			2013
Spain | Earliest Tax Year
Income Taxes
Tax years subject to examination			2014
United Kingdom | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
Foreign
Income Taxes
Cash and cash equivalents and short-term investments	$ 399,500		$ 399,500		$ 381,400

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