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Financial instruments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 04, 2019 USD ($)	Mar. 04, 2019 EUR (€)	Oct. 04, 2018 USD ($)	Oct. 04, 2018 EUR (€)
Derivatives Fair Value [Line Items]
Foreign currency translation, continuing operations, adjustments, net of tax	$ 4,195,000	$ (83,889,000)	$ 173,074,000
Interest benefit on swaps not designed as hedging instrument	18,866,000	3,277,000	0
Cash Flow Hedging
Derivatives Fair Value [Line Items]
Ineffectiveness on hedging derivatives	0	0	$ 0
Cross Currency Interest Rate Contract | Cash Flow Hedging
Derivatives Fair Value [Line Items]
Foreign currency translation, continuing operations, adjustments, net of tax	20,800,000	4,000,000.0
Not Designated as Hedging Instrument | Foreign Currency Exchange Contracts
Derivatives Fair Value [Line Items]
Loss on derivative	3,800,000	1,900,000
Total notional amount for all open foreign currency forward contracts	145,100,000	125,900,000
Not Designated as Hedging Instrument | Cross Currency Interest Rate Contract
Derivatives Fair Value [Line Items]
Interest benefit on swaps not designed as hedging instrument	18,900,000	3,300,000
Designated as Hedging Instrument | Foreign Currency Exchange Contracts | Cash Flow Hedging
Derivatives Fair Value [Line Items]
Total notional amount for all open foreign currency forward contracts	$ 132,000,000.0	$ 115,300,000
Designated as Hedging Instrument | Cross Currency Interest Rate Contract
Derivatives Fair Value [Line Items]
Total notional amount for all open foreign currency forward contracts				$ 250,000,000	€ 219,200,000	$ 500,000,000	€ 433,900,000
Derivative, number of instruments held				5	5	6	6
Derivative, fixed interest rate				4.875%	4.875%	4.625%	4.625%
Derivative, annual interest rate				2.4595%	2.4595%	1.942%	1.942%

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

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Fixed interest rate related to the interest rate derivative.

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Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments.

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