Income taxes - Uncertain tax positions for liabilities associated with unrecognized tax benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 4,260	$ 6,105	$ 7,230
Increase in unrecognized tax benefits related to prior years	0	215	0
Decrease in unrecognized tax benefits related to prior years	0	(761)	0
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(2,287)	(1,117)	(956)
(Decrease) increase in unrecognized tax benefits due to foreign currency translation	47
(Decrease) increase in unrecognized tax benefits due to foreign currency translation		(182)	(169)
Ending balance	$ 2,020	$ 4,260	$ 6,105