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Summary of Tax Returns Periods Subject to Examination by Federal, State and International Tax Authorities (Detail)	12 Months Ended
	Dec. 31, 2018
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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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