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Pension Plans and Postretirement Benefits - Summary of Total Investments Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Separate Account Investment [Line Items]      
Total Assets $ 926,395 $ 921,307  
Unclassified 554,655 537,569  
U.S. Government Securities      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 288,495 305,995  
Unclassified 0 0  
Commingled and Mutual Funds      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 231,801 230,674  
Unclassified 185,297 188,494  
Real Estate      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 123,250 132,867  
Unclassified 123,250 132,867  
Diversified Credit      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 113,271 108,363  
Unclassified 113,271 108,363  
Fixed Income      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 108,646 95,967  
Unclassified 71,905 60,404  
Partnerships with Security Holdings      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 19,752 25,259  
Unclassified 19,752 25,259  
Cash, Cash Equivalents and Accrued Items (1)      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 41,180 22,182  
Unclassified 41,180 22,182  
Level 1      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 371,740 383,738  
Level 1 | U.S. Government Securities      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 288,495 305,995  
Level 1 | Commingled and Mutual Funds      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 46,504 42,180  
Level 1 | Real Estate      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 1 | Diversified Credit      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 1 | Fixed Income      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 36,741 35,563  
Level 1 | Partnerships with Security Holdings      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 1 | Cash, Cash Equivalents and Accrued Items (1)      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 2      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 2 | U.S. Government Securities      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 2 | Commingled and Mutual Funds      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 2 | Real Estate      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 2 | Diversified Credit      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 2 | Fixed Income      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 2 | Partnerships with Security Holdings      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 2 | Cash, Cash Equivalents and Accrued Items (1)      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 3      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0 $ 46,817
Level 3 | U.S. Government Securities      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 3 | Commingled and Mutual Funds      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 3 | Real Estate      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 3 | Diversified Credit      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 3 | Fixed Income      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 3 | Partnerships with Security Holdings      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 0  
Level 3 | Cash, Cash Equivalents and Accrued Items (1)      
Fair Value, Separate Account Investment [Line Items]      
Total Assets $ 0 $ 0