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Income taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	$ (253,200,000)
Changes in deferred tax assets, net tax expense	2,900,000	$ (2,300,000)	$ (5,900,000)
Provision for income taxes that may become payable upon distribution of earnings of certain foreign subsidiaries	0
Unrecognized deferred income tax liability	26,600,000
Penalties and interest accrued related to income tax liabilities	3,900,000	$ 3,000,000.0
Reasonably possible decrease in amount of unrecognized tax benefits	2,300,000
Utilization of tax attributes, annual limitation	70,600,000
Utilization of tax attributes, cumulative limitation	346,100,000
Recognition of net income tax benefit
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	(189,000,000.0)
Expired net operating losses/tax credits
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	(28,900,000)
Translation adjustments
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	20,900,000
Other activity
Tax Credit Carryforward [Line Items]
Increase (decrease) in valuation allowance	$ (56,200,000)
Minimum
Tax Credit Carryforward [Line Items]
Expected change in ownership percentage	50.00%

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations.

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