Income taxes - Uncertain tax positions for liabilities associated with unrecognized tax benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 6,105	$ 7,230	$ 7,561
Increase in unrecognized tax benefits related to prior years	215	0	1,286
Decrease in unrecognized tax benefits related to prior years	(761)	0	0
Reductions in unrecognized tax benefits due to lapse of applicable statute of limitations	(1,117)	(956)	(1,864)
(Decrease) increase in unrecognized tax benefits due to foreign currency translation			247
(Decrease) increase in unrecognized tax benefits due to foreign currency translation	(182)	(169)
Ending balance	$ 4,260	$ 6,105	$ 7,230