Assumptions Used in Determining Benefit Obligation and Net Periodic Benefit Cost for Pension Plans (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Benefit obligations, Discount rate	0.47%	0.39%	0.53%
Benefit obligations, Rate of compensation increase	3.94%	2.33%	2.91%
Net periodic benefit cost, Discount rate	0.70%	0.98%	1.29%
Net periodic benefit cost, Rate of compensation increase	2.51%	2.33%	3.51%
Net periodic benefit cost, Expected return on plan assets	1.32%	1.82%	1.51%