Pensions and Other Post-Retirement Benefits - Weighted Average Asset Allocation by Asset Category (Detail)	Dec. 31, 2019	Dec. 31, 2018
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	100.00%	100.00%
Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	51.00%	33.00%
Fixed income securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	43.00%	50.00%
Other securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	6.00%	17.00%
The Netherlands
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	100.00%	100.00%
The Netherlands | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	39.00%	21.00%
The Netherlands | Fixed income securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	53.00%	62.00%
The Netherlands | Other securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	8.00%	17.00%
Other
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	100.00%	100.00%
Other | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	50.00%	41.00%
Other | Fixed income securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	39.00%	28.00%
Other | Other securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	11.00%	31.00%
United States
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	100.00%	100.00%
United States | Equity securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	54.00%	52.00%
United States | Fixed income securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	45.00%	47.00%
United States | Other securities
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Weighted average asset allocations	1.00%	1.00%