Stockholders' equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period			$ 362,470
Balance at end of period	$ 363,167		363,167
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(178,396)	$ (168,628)	(171,235)	$ (169,575)
Other comprehensive income (loss)	(6,233)	(1,859)	(13,394)	(912)
Balance at end of period	(184,629)	(170,487)	(184,629)	(170,487)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(66,739)	(78,409)	(68,468)	(80,704)
Other comprehensive income (loss)	828	1,133	2,557	3,428
Balance at end of period	(65,911)	(77,276)	(65,911)	(77,276)
Accumulated Defined Benefit Plans Adjustment | OPEB
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(1,184)	(1,045)	(1,053)	(910)
Other comprehensive income (loss)	(62)	(65)	(193)	(200)
Balance at end of period	(1,246)	(1,110)	(1,246)	(1,110)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(246,319)	(248,082)	(240,756)	(251,189)
Other comprehensive income (loss)	(5,467)	(791)	(11,030)	2,316
Balance at end of period	$ (251,786)	$ (248,873)	$ (251,786)	$ (248,873)