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Shareholders' equity - Change in accumulated other comprehensive income (loss), net of tax (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance $ 4,440,988 $ 4,021,968 $ 3,754,748
Other comprehensive income (loss) before reclassifications (80,152) 95,596  
Amounts reclassified from accumulated other comprehensive income 77,888 (6,479)  
Other comprehensive (loss) income (2,264) 89,117 (56,563)
Ending Balance 4,278,140 4,440,988 4,021,968
Cash Flow Hedges      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance 1,396 4,931  
Other comprehensive income (loss) before reclassifications 1,977 8,314  
Amounts reclassified from accumulated other comprehensive income (1,534) (11,849)  
Other comprehensive (loss) income 443 (3,535)  
Ending Balance 1,839 1,396 4,931
Pension and Other Postretirement Benefit Plans      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance (88,049) (135,799)  
Other comprehensive income (loss) before reclassifications 10,465 42,380  
Amounts reclassified from accumulated other comprehensive income 79,422 5,370  
Other comprehensive (loss) income 89,887 47,750  
Ending Balance 1,838 (88,049) (135,799)
Foreign Currency Translation Adjustment      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance (227,752) (272,654)  
Other comprehensive income (loss) before reclassifications (92,594) 44,902  
Amounts reclassified from accumulated other comprehensive income 0 0  
Other comprehensive (loss) income (92,594) 44,902  
Ending Balance (320,346) (227,752) (272,654)
Accumulated Other Comprehensive (Loss) Income      
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Beginning Balance (314,405) (403,522) (346,959)
Other comprehensive (loss) income (2,264) 89,117 (56,563)
Ending Balance $ (316,669) $ (314,405) $ (403,522)