Employee Benefit Plans - Additional Information (Detail) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
International Defined Benefit Pension Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected plan contributions	$ 7.1
U.S. Defined Benefit Pension Plans
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected plan contributions	$ 0.5

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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