Tax Year Returns that Remain Subject to Examination by Major Tax Jurisdiction (Detail)	12 Months Ended
	Dec. 31, 2018
Australia | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2014
Australia | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2017
Canada | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2014
Canada | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2017
France | Period 1
Income Tax Examination [Line Items]
Open Tax Years	2017
France | Earliest Tax Year | Period 2
Income Tax Examination [Line Items]
Open Tax Years	2009
France | Latest Tax Year | Period 2
Income Tax Examination [Line Items]
Open Tax Years	2010
GERMANY | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2013
GERMANY | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2017
HONG KONG | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2014
HONG KONG | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2017
Japan | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2010
Japan | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2017
SINGAPORE | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2014
SINGAPORE | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2018
SWITZERLAND | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2016
SWITZERLAND | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2017
U.K. | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2016
U.K. | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2017
U.S. | Earliest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2015
U.S. | Latest Tax Year
Income Tax Examination [Line Items]
Open Tax Years	2017