Weighted Average Assumptions Relate to All Pension Plans of Company, Except for Certain Multi-Employer and Defined Contribution Plans (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Discount rate	2.60%	2.20%
Rate of increase in future compensation levels	3.80%	3.70%
Assumed long-term rate of return on plan assets	5.90%	6.20%