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Pension and other postretirement benefits - Fair values of pension plan assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Maximum percentage of net assets invested in emerging market 35.00%  
Minimum    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Effective average duration to maintain 3 years  
Maximum    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Effective average duration to maintain 10 years  
Emerging markets debt fund    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Percentage of net assets invested in foreign equity securities 80.00%  
Small and Mid-Sized Companies | Equity Securities | U.S. Russell 2500 Index    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Percentage of net assets invested 80.00%  
Foreign Companies    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Percentage of net assets invested in foreign equity securities 80.00%  
Fair Value, Measurements, Recurring    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets $ 357,270 $ 469,793
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 357,270 459,105
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 287,004 439,093
Fair Value, Measurements, Recurring | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 59,152 879
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 11,114 19,133
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets   10,688
Fair Value, Measurements, Recurring | Cash | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 769 923
Fair Value, Measurements, Recurring | Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 769 923
Fair Value, Measurements, Recurring | Cash | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Cash | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Money market funds | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 13 6
Fair Value, Measurements, Recurring | Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 13 6
Fair Value, Measurements, Recurring | Money market funds | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Money market funds | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Managed Volatility | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 46,721 57,252
Fair Value, Measurements, Recurring | Managed Volatility | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 46,721 57,252
Fair Value, Measurements, Recurring | Managed Volatility | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Managed Volatility | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | U.S. Small/Mid-Cap Equity | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 6,054 7,532
Fair Value, Measurements, Recurring | U.S. Small/Mid-Cap Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 6,054 7,532
Fair Value, Measurements, Recurring | U.S. Small/Mid-Cap Equity | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | U.S. Small/Mid-Cap Equity | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | World equity (excluding U.S.) | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 28,159 34,287
Fair Value, Measurements, Recurring | World equity (excluding U.S.) | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 28,159 34,287
Fair Value, Measurements, Recurring | World equity (excluding U.S.) | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | World equity (excluding U.S.) | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Intermediate duration bond fund | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 105,865 101,363
Fair Value, Measurements, Recurring | Intermediate duration bond fund | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 105,865 101,363
Fair Value, Measurements, Recurring | Intermediate duration bond fund | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Intermediate duration bond fund | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Long duration bond fund | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 87,018 171,919
Fair Value, Measurements, Recurring | Long duration bond fund | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 87,018 171,919
Fair Value, Measurements, Recurring | Long duration bond fund | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Long duration bond fund | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Corporate bond fund | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 6,092 7,607
Fair Value, Measurements, Recurring | Corporate bond fund | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 6,092 7,607
Fair Value, Measurements, Recurring | Corporate bond fund | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Corporate bond fund | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Emerging markets debt fund | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 6,284 7,605
Fair Value, Measurements, Recurring | Emerging markets debt fund | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 6,284 7,605
Fair Value, Measurements, Recurring | Emerging markets debt fund | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Emerging markets debt fund | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Corporate, government and foreign bonds | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 58,572 50,599
Fair Value, Measurements, Recurring | Corporate, government and foreign bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 50,599
Fair Value, Measurements, Recurring | Corporate, government and foreign bonds | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 58,572 0
Fair Value, Measurements, Recurring | Corporate, government and foreign bonds | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Absolute return credit fund | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 427 671
Fair Value, Measurements, Recurring | Absolute return credit fund | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Absolute return credit fund | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 427 671
Fair Value, Measurements, Recurring | Absolute return credit fund | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Asset backed – home loans | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 153 208
Fair Value, Measurements, Recurring | Asset backed – home loans | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Asset backed – home loans | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 153 208
Fair Value, Measurements, Recurring | Asset backed – home loans | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Structured Credit | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 29  
Fair Value, Measurements, Recurring | Structured Credit | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 29  
Fair Value, Measurements, Recurring | Structured Credit | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets  
Fair Value, Measurements, Recurring | Structured Credit | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0  
Fair Value, Measurements, Recurring | Contract with insurance company | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 11,114 19,130
Fair Value, Measurements, Recurring | Contract with insurance company | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Contract with insurance company | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets 0 0
Fair Value, Measurements, Recurring | Contract with insurance company | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets $ 11,114 19,130
Fair Value, Measurements, Recurring | Other | Fair Value, Inputs, Level 1, 2 and 3    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets   3
Fair Value, Measurements, Recurring | Other | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets   0
Fair Value, Measurements, Recurring | Other | Significant Observable Inputs (Level 2)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets   0
Fair Value, Measurements, Recurring | Other | Significant Unobservable Inputs (Level 3)    
Schedule Of Pension Plan Assets By Fair Value [Line Items]    
Fair value of plan assets   $ 3