Income Taxes - Additional Information (Detail) € in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 31, 2018	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 EUR (€)
Income Taxes [Line Items]
Valuation allowance increase (decrease)	$ (9,200)		$ (9,973)	$ (8,535)	$ 1,216
Impact of unrecognized tax benefits on effective tax rate			1,806
Earnings of foreign subsidiaries permanently reinvest outside the U.S			$ 53,747
Corporate tax rate			35.00%	34.00%	34.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ 12,812
Tax cuts and jobs Act, increased tax provision on undistributed and previously untaxed post-1986 earnings and profits of the specified foreign corporation			$ 3,266
Latest Tax Year
Income Taxes [Line Items]
Net operating loss and business tax credit carry forwards expiration date			At various dates through December 2037
Scenario, Forecast
Income Taxes [Line Items]
Corporate tax rate		21.00%
TangenX Technology Corporation
Income Taxes [Line Items]
Valuation allowance increase (decrease)	$ (5,872)
Domestic Tax Authority
Income Taxes [Line Items]
Business tax credits carry forwards			$ 297
State
Income Taxes [Line Items]
Business tax credits carry forwards			99
Federal and State
Income Taxes [Line Items]
Increase in net operating loss carryovers			5,100
United States
Income Taxes [Line Items]
Net operating loss carry forwards			19,652
Germany
Income Taxes [Line Items]
Net operating loss carry forwards			$ 722			€ 603