Retirement Benefit Plans - Additional Information (Detail) - Foreign-based Defined Benefit Plans [Member] $ in Millions	3 Months Ended
Mar. 31, 2019 USD ($)
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Contribution towards defined benefit plans	$ 4.9
Expected contribution during remainder of year	$ 14.7

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration