Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Undistributed earnings offsetting with dividend received deduction percent	100.00%
Income tax holiday, amount of corporate income tax savings realized	$ 21,866	$ 10,285	$ 16,220
Total unrecognized tax benefits	$ 4,967	3,795	2,819	$ 3,812
Macedonia
Income Taxes [Line Items]
Income tax holiday, description	The government of Macedonia granted the Company a tax holiday that released the Company from the obligation to pay corporate income taxes for a ten year period, subject to certain limitations.
Income tax holiday, period	10 years
Income tax holiday, amount of corporate income tax savings realized	$ 0	$ 0	$ 0
U.S. State | Earliest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration	2021
U.S. State | Latest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration	2040
Non-U.S. Subsidiaries
Income Taxes [Line Items]
Operating loss carryforward, amount	$ 169,293
Operating loss valuation allowance	5,787
Foreign Jurisdictions
Income Taxes [Line Items]
Operating loss carryforward, amount	$ 7,441
Foreign Jurisdictions | Earliest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration	2021
Foreign Jurisdictions | Latest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration	2025
Indefinite
Income Taxes [Line Items]
Operating loss carryforward, amount	$ 161,851
Net operating loss carryforward, year of expiration	no expiration date