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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 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	$ 815,000		$ 4,600,000
Interest Expense, Net | Cash Flow Hedging | Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Gain reclassified out of AOCI into other (income) expenses	456,000	$ 1,500,000	3,400,000	$ 2,200,000
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	$ 815,000	$ 0	$ 4,600,000	$ 0