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Schedule of Weighted Average Pension Assets Allocations by Category (Detail)	Dec. 31, 2018	Dec. 31, 2017
UNITED STATES
Defined Benefit Plan Disclosure
Total	100.00%	100.00%
UNITED STATES | Fixed income securities
Defined Benefit Plan Disclosure
Total	94.00%	88.10%
UNITED STATES | Equity securities
Defined Benefit Plan Disclosure
Total	5.00%	9.90%
UNITED STATES | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	1.00%	2.00%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure
Total	100.00%	100.00%
Foreign Pension Plans, Defined Benefit | Fixed income securities
Defined Benefit Plan Disclosure
Total
Foreign Pension Plans, Defined Benefit | Equity securities
Defined Benefit Plan Disclosure
Total
Foreign Pension Plans, Defined Benefit | Other than Securities Investment
Defined Benefit Plan Disclosure
Total	100.00%	100.00%

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Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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