Pension and Postretirement Benefits - Change in Projected Benefit Obligation and Plan Assets (Parenthetical) (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Pension Plans [Member] \| Non-U. S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expect to recognize previously unrecognized net prior service costs in 2019	$ 0.2
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expect to recognize previously unrecognized net prior service costs in 2019	1.0
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Total benefits remaining under the defined plan	$ 1.0

Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (s)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant