Derivatives and Hedging Activities - Narrative (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) derivative	Dec. 31, 2017 USD ($) derivative	Dec. 31, 2016 USD ($)	Jun. 30, 2015 EUR (€)	Mar. 31, 2015 USD ($)
4.50% Senior Notes due September 2023
Derivative [Line Items]
Debt interest rate	4.50%
Foreign Currency Forward Contracts
Derivative [Line Items]
Fair Value of (liability) derivatives	$ 600,000	$ (1,600,000)
Foreign Currency Forward Contracts | Not Designated as Hedging Instruments
Derivative [Line Items]
Maximum original maturity period of foreign currency forward contracts	12 months
Foreign Currency Forward Contracts | Designated as Hedging Instruments
Derivative [Line Items]
Unrealized gain (losses) on derivative instruments, net of taxes	$ 2,900,000	$ (5,000,000)	$ 1,500,000
Estimate of net unrealized gains that will be reclassified into earnings	$ 1,500,000
Maximum original maturity period of foreign currency forward contracts	12 months
Interest Rate Swaps
Derivative [Line Items]
Number of derivative instruments outstanding | derivative	0	0
EUR - Denominated debt | Net Investment Hedge | 4.50% Senior Notes due September 2023
Derivative [Line Items]
Debt instrument face amount | €				€ 400,000,000
Debt interest rate				4.50%
EUR - Denominated debt | Designated as Hedging Instruments | Net Investment Hedge
Derivative [Line Items]
Fair Value of (liability) derivatives	$ 7,800,000
Fair value of (liability) derivatives, after tax	5,900,000
Cross-currency swaps | Net Investment Hedge
Derivative [Line Items]
Notional amount of outstanding derivative					$ 425,000,000
Cross-currency swaps | Designated as Hedging Instruments | Net Investment Hedge
Derivative [Line Items]
Fair Value of (liability) derivatives	$ 61,900,000
Semi-annual interest settlement resulted in AOCI		$ 17,700,000
Semi-annual interest settlement resulted in AOCI after tax		$ (44,200,000)