Share Capital - Schedule of Share Capital (Detail) - shares	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Registered share capital	61,037,000	52,268,000
Authorized share capital	103,901,006	90,343,803
Employee Benefit Plans [Member]
Class of Stock [Line Items]
Conditional share capital - Bonds or similar debt instruments	18,698,000	15,579,000
Bonds or Similar Debt Instruments [Member]
Class of Stock [Line Items]
Conditional share capital - Bonds or similar debt instruments	4,920,000	4,920,000
Swiss Law [Member]
Class of Stock [Line Items]
Authorized share capital	19,246,000	17,577,000