Income taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Income tax benefit, principally related to Tax Cuts and Jobs Act			$ 50,400,000
Rate change in the company's income tax provision	$ 500,000	$ (2,300,000)	$ (400,000)
Provision for income taxes that may become payable upon distribution of earnings of certain foreign subsidiaries	0
Unrecognized deferred income tax liability	29,200,000
Penalties and interest accrued related to income tax liabilities	3,000,000.0	2,600,000
Utilization of tax attributes, annual limitation	70,600,000
Utilization of tax attributes, cumulative limitation	$ 470,300,000
Minimum
Tax Credit Carryforward [Line Items]
Expected change in ownership percentage	50.00%
Netherlands
Tax Credit Carryforward [Line Items]
Rate change in the company's income tax provision		$ (2,200,000)