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Pension and other post-retirement benefits - Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Change in plan assets    
Non-current assets (note 11) $ 26,482 $ 23,630
Pension benefits    
Change in projected benefit obligation    
Projected benefit obligation, beginning of year 765,618 834,913
Projected benefit obligation assumed from business combination 87,933 0
Plan Settlements (112) (1,294)
Service cost 16,309 14,673
Interest cost 24,787 20,676
Actuarial gain (198,074) (36,597)
Contributions from retirees 0 0
Plan amendments 0 237
Medicare Part D 0 0
Benefits paid (68,197) (66,800)
Foreign exchange (129) (190)
Projected benefit obligation, end of year 628,135 765,618
Change in plan assets    
Fair value of plan assets, beginning of year 648,864 629,157
Plan assets acquired in business combination 74,532 0
Actual return on plan assets (109,118) 58,721
Employer contributions 23,296 29,058
Plan Settlements (112) (1,294)
Contributions from retirees 0 0
Medicare Part D subsidy receipts 0 0
Benefits paid (68,197) (66,800)
Foreign exchange (10) 22
Fair value of plan assets, end of year 569,255 648,864
Unfunded status (58,880) (116,754)
Non-current assets (note 11) 12,264 11,751
Current liabilities (1,907) (1,902)
Non-current liabilities (69,237) (126,603)
Net amount recognized (58,880) (116,754)
OPEB    
Change in projected benefit obligation    
Projected benefit obligation, beginning of year 292,646 306,524
Projected benefit obligation assumed from business combination 5,195 0
Plan Settlements 0 0
Service cost 6,277 7,307
Interest cost 9,146 8,048
Actuarial gain (82,991) (18,977)
Contributions from retirees 2,220 2,040
Plan amendments (2,452) 310
Medicare Part D 367 373
Benefits paid (13,078) (12,979)
Foreign exchange 0 0
Projected benefit obligation, end of year 217,330 292,646
Change in plan assets    
Fair value of plan assets, beginning of year 192,375 176,616
Plan assets acquired in business combination 8,577 0
Actual return on plan assets (30,105) 15,200
Employer contributions 11,811 11,178
Plan Settlements 0 0
Contributions from retirees 2,220 1,988
Medicare Part D subsidy receipts 367 372
Benefits paid (13,078) (12,979)
Foreign exchange 0 0
Fair value of plan assets, end of year 172,167 192,375
Unfunded status (45,163) (100,271)
Non-current assets (note 11) 14,218 11,879
Current liabilities (3,039) (699)
Non-current liabilities (56,342) (111,451)
Net amount recognized $ (45,163) $ (100,271)