Defined contribution and defined benefit retirement - Summary of Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (Credit) (Detail) - Pension Plans Defined Benefit [Member]	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
United States
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	5.30%	2.60%	2.20%
Long-term return on plan assets	5.00%	4.00%	4.00%
Non U.S.
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	3.90%	1.50%	1.00%
Increase in future compensation levels	2.70%	2.60%	2.60%
Long-term return on plan assets	4.60%	2.50%	2.40%