Employee Benefit Plans - Weighted Average Asset Allocations by Asset Category (Detail)	Dec. 31, 2021	Dec. 31, 2020
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation as of December 31 (percentage)	100.00%	100.00%
Target Asset (percentage)	100.00%
Equity securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation as of December 31 (percentage)	33.00%	34.00%
Target Asset (percentage)	32.00%
Debt securities
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation as of December 31 (percentage)	53.00%	44.00%
Target Asset (percentage)	54.00%
Insurance (annuity) contracts
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation as of December 31 (percentage)	11.00%	12.00%
Target Asset (percentage)	11.00%
Real estate
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation as of December 31 (percentage)	3.00%	8.00%
Target Asset (percentage)	3.00%
Other
Schedule of Defined Benefit Plan Asset Allocation Targets [Line Items]
Actual Asset Allocation as of December 31 (percentage)	0.00%	2.00%
Target Asset (percentage)	0.00%