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Shareholders' equity - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Sep. 30, 2021 EUR (€) € / shares shares	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Class of Stock [Line Items]
Share capital | $	$ 116,892,000	$ 205,491,000			$ 143,019,000	$ 169,176,000	$ 233,099,000	$ 251,739,000	$ 299,662,000	$ 193,186,000
Warrant [Member]
Class of Stock [Line Items]
Stock Issued During Period, Value, Stock Options Exercised | $	$ 10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares	82,500
Share Capital
Class of Stock [Line Items]
Share capital	$ 6,528,543,000			€ 5,501,168,700
Nominal value | € / shares				€ 0.10
Share capital authorized | shares	55,011,687			55,011,687
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings		$ 797,822,881	€ 695,575,130.36

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Amount of decrease in additional paid in capital (APIC) resulting from dividends legally declared (or paid) in excess of retained earnings balance.

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Number of share options (or share units) exercised during the current period.

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Value of stock issued as a result of the exercise of stock options.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.

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The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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