Summary of Tax Returns Periods Subject to Examination by Federal, State and International Taxing Authorities (Detail) |
12 Months Ended |
---|---|
Dec. 31, 2017 | |
United States | Earliest Tax Year | |
Income Tax Examination [Line Items] | |
Fiscal year subject to examination | 2014 |
United States | Latest Tax Year | |
Income Tax Examination [Line Items] | |
Fiscal year subject to examination | 2017 |
Sweden | Earliest Tax Year | |
Income Tax Examination [Line Items] | |
Fiscal year subject to examination | 2011 |
Sweden | Latest Tax Year | |
Income Tax Examination [Line Items] | |
Fiscal year subject to examination | 2017 |
Germany | Earliest Tax Year | |
Income Tax Examination [Line Items] | |
Fiscal year subject to examination | 2016 |
Germany | Latest Tax Year | |
Income Tax Examination [Line Items] | |
Fiscal year subject to examination | 2017 |
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 | 2017 |