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Pension Plans and Postretirement Benefits - Summary of Total Investments Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Separate Account Investment [Line Items]      
Total Assets $ 921,307 $ 1,310,311  
Unclassified 537,569 655,149  
U.S. Government Securities      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 305,995 369,980  
Unclassified 0 0  
Commingled and Mutual Funds      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 230,674 358,423  
Unclassified 188,494 280,743  
Real Estate      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 132,867 126,886  
Unclassified 132,867 126,886  
Diversified Credit      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 108,363 133,508  
Unclassified 108,363 133,508  
Fixed Income      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 95,967 182,169  
Unclassified 60,404 21,484  
Partnerships with Security Holdings      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 25,259 46,515  
Unclassified 25,259 46,515  
Cash, Cash Equivalents and Accrued Items (1)      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 22,182 46,013  
Unclassified 22,182 46,013  
Investment Contracts      
Fair Value, Separate Account Investment [Line Items]      
Total Assets   46,817  
Unclassified   0  
Level 1      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 383,738 474,831  
Level 1 | U.S. Government Securities      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 305,995 365,295  
Level 1 | Commingled and Mutual Funds      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 42,180 77,680  
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 35,563 31,856  
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 1 | Investment Contracts      
Fair Value, Separate Account Investment [Line Items]      
Total Assets   0  
Level 2      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 133,514  
Level 2 | U.S. Government Securities      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 4,685  
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 0 128,829  
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 2 | Investment Contracts      
Fair Value, Separate Account Investment [Line Items]      
Total Assets   0  
Level 3      
Fair Value, Separate Account Investment [Line Items]      
Total Assets 0 46,817 $ 0
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  
Level 3 | Investment Contracts      
Fair Value, Separate Account Investment [Line Items]      
Total Assets   $ 46,817