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Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
Transition tax, unpaid	$ 28,039,000
Measurement period adjustment to reduce transition tax			$ (3,100,000)
Provision for transition tax			$ 37,200,000	$ 40,300,000
Effective U.S corporate tax rate	21.00%	21.00%	21.00%	35.00%
Retained earnings	$ 575,965,000	$ 583,489,000
Domestic and foreign, tax expense on undistributed earnings	1,700,000
Unrecognized tax benefits	4,588,000
Unrecognized tax benefits would impact the effective tax rate	4,300,000
Accumlated interest accrued	295,000	200,000
Valuation allowances	1,259,000	2,130,000
U.S
Income Taxes
Cash and cash equivalents and short-term investments	13,700,000	289,400,000
Operating loss carryforwards	$ 0	0
U.S | Earliest Tax Year
Income Taxes
Tax years subject to examination	2016
Foreign
Income Taxes
Cash and cash equivalents and short-term investments	$ 46,000,000.0	276,200,000
Retained earnings	136,300,000	231,200,000
Operating loss carryforwards	$ 7,900,000	$ 4,100,000
China | Tax Year 2008
Income Taxes
Tax years settled which were under tax examination			2008
China | Tax Year 2009
Income Taxes
Tax years settled which were under tax examination			2009
China | Tax Year 2010
Income Taxes
Tax years settled which were under tax examination			2010
China | Tax Year 2011
Income Taxes
Tax years settled which were under tax examination			2011
China | Tax Year 2012
Income Taxes
Tax years settled which were under tax examination			2012
China | Tax Year 2013
Income Taxes
Tax years settled which were under tax examination			2013
China | Tax Year 2014
Income Taxes
Tax years settled which were under tax examination			2014
China | Tax Year 2015
Income Taxes
Tax years settled which were under tax examination			2015
China | Tax Year 2016
Income Taxes
Tax years settled which were under tax examination			2016
ITALY | Earliest Tax Year
Income Taxes
Tax years subject to examination	2016
ITALY | Tax Year 2013
Income Taxes
Tax years settled which were under tax examination		2013
ITALY | Tax Year 2014
Income Taxes
Tax years settled which were under tax examination		2014
ITALY | Tax Year 2015
Income Taxes
Tax years settled which were under tax examination		2015
Poland | Earliest Tax Year
Income Taxes
Tax years subject to examination	2016
Spain | Earliest Tax Year
Income Taxes
Tax years subject to examination	2017
Germany | Earliest Tax Year
Income Taxes
Tax years subject to examination	2016
United Kingdom | Earliest Tax Year
Income Taxes
Tax years subject to examination	2019
Other Long-term Liabilities
Income Taxes
Transition tax, unpaid	$ 25,100,000
Accounts Payable, Accrued Expenses and Operating Lease Liabilities
Income Taxes
Transition tax, unpaid	$ 3,000,000.0

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