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
Mar. 31, 2019	Mar. 31, 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	$ 3,800,000
Interest Expense, Net \| Cash Flow Hedging \| Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain reclassified out of AOCI into other (income) expenses	2,900,000	$ 709,000
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	$ 3,800,000	$ 0

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
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894

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

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