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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount recognized for uncertainty in income taxes classified as noncurrent.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes
Transition tax, unpaid		$ 28,935,000
Measurement period adjustment to reduce transition tax	$ (3,100,000)		$ (3,100,000)
Provision for transition tax			$ 37,200,000	$ 40,300,000
Effective U.S corporate tax rate		21.00%	21.00%	35.00%
Tax provision charge related to re-measurement of net deferred tax assets				$ 3,700,000
Retained earnings		$ 583,489,000	$ 549,134,000
Undistributed foreign earnings		231,200,000
Unrecognized tax benefits		1,726,000
Unrecognized tax benefits would impact the effective tax rate		1,600,000
Interest accrued		163,000	700,000
Valuation allowances		2,130,000	1,507,000
U.S
Income Taxes
Cash and cash equivalents and short-term investments		289,400,000	173,600,000
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		$ 276,200,000	402,500,000
Retained earnings		431,200,000	397,400,000
Operating loss carryforwards		$ 4,100,000	$ 3,600,000
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		2015
Spain \| Earliest Tax Year
Income Taxes
Tax years subject to examination		2016
Germany \| Earliest Tax Year
Income Taxes
Tax years subject to examination		2016
United Kingdom \| Earliest Tax Year
Income Taxes
Tax years subject to examination		2018
Other Long-term Liabilities
Income Taxes
Transition tax, unpaid		$ 28,000,000.0
Accounts Payable, Accrued Expenses and Operating Lease Liabilities
Income Taxes
Transition tax, unpaid		$ 900,000