Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 45
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894

Name:	us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Summary of Effects of Interest Rate Swap Agreements and Foreign Currency Foreign Exchange Contracts on Result of Operations (Parenthetical) (Detail) - Designated As Hedging Instrument - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
UK \| Net Investment Hedge \| Foreign Currency Foreign Exchange Contracts
Derivative Instruments Gain Loss [Line Items]
Loss recorded on repatriation of cash related to investment	$ 1,100,000		$ 5,700,000
Interest Expense, Net \| Cash Flow Hedging \| Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain reclassified out of AOCI into other (income) expenses	0	$ 2,000,000.0	3,400,000	$ 4,200,000
Other (Income) Expense, Net \| Net Investment Hedge \| Foreign Currency Foreign Exchange Contracts
Derivative Instruments Gain Loss [Line Items]
Gain reclassified out of AOCI into other (income) expenses	$ 1,100,000	$ 0	$ 5,700,000	$ 0