Stockholders' equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	$ 369,812
Balance at end of period	396,904	$ 369,812
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(177,119)	(178,191)	$ (171,235)
Other comprehensive income (loss) - unrealized gain (loss) arising during the period	(8,304)	1,072	(6,956)
Balance at end of period	(185,423)	(177,119)	(178,191)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(41,373)	(43,857)	(68,468)
Other comprehensive income (loss) - unrealized gain (loss) arising during the period	1,504	1,436	3,592
Net actuarial gain (loss) arising during the year	3,134	(3,094)	20,881
Plan settlement	69	4,142	138
Balance at end of period	(36,666)	(41,373)	(43,857)
Other | OPEB plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(1,114)	(893)	(1,053)
Other comprehensive income (loss) - unrealized gain (loss) arising during the period	(195)	(357)	(369)
Net actuarial gain (loss) arising during the year	42	136	529
Balance at end of period	(1,267)	(1,114)	(893)
Marketable debt securities
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(15)	(50)
Other comprehensive income (loss) - unrealized gain (loss) arising during the period	15	35	(50)
Balance at end of period		(15)	(50)
Total accumulated other comprehensive loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(219,621)	(222,991)	(240,756)
Other comprehensive income (loss) - unrealized gain (loss) arising during the period	(3,735)	3,370	17,765
Balance at end of period	$ (223,356)	$ (219,621)	$ (222,991)