Income taxes - Reconciliations between statutory federal income tax rate and effective income tax rate (Detail)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	21.00%
Tax effect of international items	(57.60%)	(6.10%)	(4.60%)
Pension settlement charge	(38.50%)	(0.20%)	0.00%
Legal entity rationalization - deferred taxes	0.00%	5.70%	0.00%
Excess tax benefits related to share-based compensation	2.00%	(0.30%)	(0.30%)
State taxes, net of federal benefit	10.40%	0.60%	3.40%
Uncertain tax contingencies	(1.20%)	(0.60%)	(0.40%)
Contingent consideration	3.80%	(1.30%)	0.10%
Goodwill impairment charge	66.80%	0.00%	0.00%
Research and development tax credit	(5.90%)	(1.30%)	(1.00%)
Other, net	6.20%	0.10%	0.50%
Effective income tax rate, total	7.00%	17.60%	18.60%