Income taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Comprehensive provision for income taxes allocable to:
Net income	$ 988	$ 1,421
Additional paid-in capital	0	(92)
Other comprehensive income (loss):
Currency translation	(1,320)	(443)
Other	(8)	(34)
Total	(239)	956
Defined Benefit Pension Plans
Other comprehensive income (loss):
Pension plans	$ 101	$ 104