Schedule of Weighted Average Pension Assets Allocations by Category (Detail)	Dec. 31, 2019	Dec. 31, 2018
UNITED STATES
Defined Benefit Plan Disclosure
Total	100.00%	100.00%
UNITED STATES | Fixed income securities
Defined Benefit Plan Disclosure
Total	94.00%	94.00%
UNITED STATES | Equity securities
Defined Benefit Plan Disclosure
Total	5.00%	5.00%
UNITED STATES | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	1.00%	1.00%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	100.00%	100.00%
Foreign Pension Plans, Defined Benefit | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	100.00%	100.00%