Employee Benefit Plans - Assumption Rates Used for Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate minimum	1.20%	2.50%
Discount rate maximum	2.40%	3.20%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate minimum	0.70%	0.90%
Discount rate maximum	1.80%	2.30%
Salary increase minimum	1.75%	1.80%
Salary increase maximum	2.90%	3.10%