Pension Plans, Postretirement and Other Employee Benefits - Pension Plan Assets Classes of Securities (Detail)	Dec. 31, 2018
U.S. | Equity securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	62.00%
U.S. | Fixed income securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	17.00%
U.S. | Debt Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	11.00%
U.S. | Insurance contracts
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	0.00%
U.S. | Other
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	10.00%
Non-U.S. | Equity securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	32.00%
Non-U.S. | Fixed income securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	5.00%
Non-U.S. | Debt Securities
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	43.00%
Non-U.S. | Insurance contracts
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	15.00%
Non-U.S. | Other
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Debt Securities	5.00%