Tax Year Returns that Remain Subject to Examination by Major Tax Jurisdiction (Detail)	12 Months Ended
	Dec. 31, 2020
Australia | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2015
Australia | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
Canada | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2016
Canada | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
France | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2017
France | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
GERMANY | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2019
GERMANY | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
HONG KONG | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2014
HONG KONG | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
Japan
Income Tax Examination [Line Items]
Open Tax Year	2020
Luxembourg | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2019
Luxembourg | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
SINGAPORE | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2016
SINGAPORE | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
SWITZERLAND | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2018
SWITZERLAND | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
U.K. | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2014
U.K. | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020
U.S. | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2015
U.S. | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Year	2020