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Short-term investments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Accrued interest	$ 1.0	$ 1.0	$ 1.4
Interest Income [Member]
Debt Securities, Available-for-Sale [Line Items]
Gain (loss) in short-term investments	$ 0.2	$ 0.5

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- Definition

Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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