Summary of Tax Returns Periods Subject to Examination by Federal, State and International Tax Authorities (Detail)	3 Months Ended
	Mar. 31, 2019
United States | Earliest Tax Year
Income Tax Examination [Line Items]
Fiscal year subject to examination	2015
United States | Latest Tax Year
Income Tax Examination [Line Items]
Fiscal year subject to examination	2018
Sweden | Earliest Tax Year
Income Tax Examination [Line Items]
Fiscal year subject to examination	2012
Sweden | Latest Tax Year
Income Tax Examination [Line Items]
Fiscal year subject to examination	2018
Germany | Earliest Tax Year
Income Tax Examination [Line Items]
Fiscal year subject to examination	2017
Germany | Latest Tax Year
Income Tax Examination [Line Items]
Fiscal year subject to examination	2018
Netherlands | Earliest Tax Year
Income Tax Examination [Line Items]
Fiscal year subject to examination	2012
Netherlands | Latest Tax Year
Income Tax Examination [Line Items]
Fiscal year subject to examination	2018