Shareholders' equity - Change in accumulated other comprehensive income (loss), net of tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 3,336,457	$ 2,979,320
Other comprehensive (loss) income before reclassifications	(56,648)	39,395
Amounts reclassified from accumulated other comprehensive income	6,987	7,699
Net current-year other comprehensive (loss) income	(49,661)	47,094
Ending Balance	3,754,748	3,336,457
Cash Flow Hedges
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(482)	735
Other comprehensive (loss) income before reclassifications	351	(3,331)
Amounts reclassified from accumulated other comprehensive income	1,212	2,114
Net current-year other comprehensive (loss) income	1,563	(1,217)
Ending Balance	1,081	(482)
Pension and Other Postretirement Benefit Plans
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(150,257)	(138,810)
Other comprehensive (loss) income before reclassifications	6,192	(17,032)
Amounts reclassified from accumulated other comprehensive income	5,775	5,585
Net current-year other comprehensive (loss) income	11,967	(11,447)
Ending Balance	(138,290)	(150,257)
Foreign Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(146,559)	(206,317)
Other comprehensive (loss) income before reclassifications	(63,191)	59,758
Amounts reclassified from accumulated other comprehensive income	0	0
Net current-year other comprehensive (loss) income	(63,191)	59,758
Ending Balance	(209,750)	(146,559)
Accumulated Other Comprehensive Income (loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(297,298)	(344,392)
Ending Balance	$ (346,959)	$ (297,298)