Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Taxes
Unrecognized tax benefits	$ 4,300		$ 4,300
Unrecognized tax benefits would impact the effective tax rate	3,500		3,500
Interest accrued	700		$ 700
Effective tax rate from operations			16.70%	16.90%
Provision for (benefit from) income taxes	2,197	$ 3,414	$ 8,804	$ 12,162
Undistributed foreign earnings					$ 322,000
U.S. statutory rate			35.00%
U.S
Income Taxes
Cash and cash equivalents and short-term investments	284,100		$ 284,100		279,800
U.S | Earliest Tax Year
Income Taxes
Tax years subject to examination			2013
Germany | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
Poland | Earliest Tax Year
Income Taxes
Tax years subject to examination			2012
China | Earliest Tax Year
Income Taxes
Tax years subject to examination			2012
Spain | Earliest Tax Year
Income Taxes
Tax years subject to examination			2014
United Kingdom | Earliest Tax Year
Income Taxes
Tax years subject to examination			2015
Foreign
Income Taxes
Cash and cash equivalents and short-term investments	$ 362,000		$ 362,000		$ 309,600