Defined Contribution and Defined Benefit Retirement - Summary of Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (Credit) (Detail) - Defined Benefit Pension Plans	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
U.S.
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	3.10%	4.10%	3.50%
Long-term return on plan assets	4.50%	5.50%	7.50%
Non U.S.
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	1.40%	2.10%	2.10%
Increase in future compensation levels	2.60%	2.60%	2.60%
Long-term return on plan assets	2.00%	2.90%	3.00%