Employee Benefit Plans - Assumption Rates Used for Net Periodic Benefit Costs (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate minimum	2.50%	3.90%	3.00%
Discount rate maximum	3.20%	4.20%	3.60%
Expected return on assets	4.80%	5.70%	5.60%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate minimum	0.00%	1.80%	1.80%
Discount rate maximum	2.30%	2.90%	2.40%
Salary increase minimum	1.80%	1.80%	1.80%
Salary increase maximum	3.10%	3.40%	3.30%
Expected return on assets, minimum	0.00%	1.90%	1.80%
Expected return on assets, maximum	4.50%	4.30%	4.00%