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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
Estimated one-time tax provision		$ 44,000,000		$ 44,000,000
Transition tax			$ 28,935,000
Measurement period adjustment to reduce transition tax	$ 3,100,000		3,100,000
Provision for transition tax		40,300,000	37,200,000	$ 40,300,000
Transition tax paid			$ 8,300,000
Effective U.S corporate tax rate			21.00%	35.00%	35.00%
Tax provision charge related to re-measurement of net deferred tax assets		3,700,000		$ 3,700,000
Undistributed foreign earnings			$ 197,400,000
Retained earnings		526,633,000	549,134,000	526,633,000
Unrecognized tax benefits			4,764,000
Unrecognized tax benefits would impact the effective tax rate			4,200,000
Interest accrued		600,000	705,000	600,000
Valuation allowances		1,015,000	1,507,000	1,015,000
U.S
Income Taxes
Cash and cash equivalents and short-term investments		293,800,000	173,600,000	293,800,000
Operating loss carryforwards		0	$ 0	0
U.S | Earliest Tax Year
Income Taxes
Tax years subject to examination			2015
Foreign
Income Taxes
Cash and cash equivalents and short-term investments		381,400,000	$ 402,500,000	381,400,000
Retained earnings		360,900,000	397,400,000	360,900,000
Operating loss carryforwards		2,500,000	$ 3,600,000	2,500,000
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			2013
Poland | Earliest Tax Year
Income Taxes
Tax years subject to examination			2014
Spain | Earliest Tax Year
Income Taxes
Tax years subject to examination			2015
Germany | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
United Kingdom | Earliest Tax Year
Income Taxes
Tax years subject to examination			2016
Other Long-term Liabilities
Income Taxes
Transition tax		$ 36,800,000	$ 28,900,000	$ 36,800,000

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