Income taxes - Components of Comprehensive Provision (Benefit) for Income Taxes Allocation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Comprehensive provision (benefit) for income taxes allocable to:
Net income (loss)	$ 14,057	$ (7,001)	$ 2,785
Other comprehensive income (loss):
Currency translation	(2,207)	241	(1,849)
Other	(28)	(35)	69
Total	13,073	(7,086)	7,547
Defined Benefit Pension Plans
Other comprehensive income (loss):
Pension plans	$ 1,251	$ (291)	$ 6,542