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Commitments and contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Commitments and contingencies    
Balance at the beginning of the period $ 92,940  
Additions charged to expense, net 549  
Payments, net (453)  
Balance at the end of the period 93,036  
Amounts recognized in the Condensed Consolidated Balance Sheet at the end of the period:    
Current liability 2,753 $ 2,643
Noncurrent liability $ 90,283 $ 90,297