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Pension Plans and Postretirement Benefits - Summary of Total Investments Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Separate Account Investment [Line Items]    
Total Assets $ 1,310,311 $ 1,333,309
Unclassified 655,149 715,313
Fixed Income    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 182,169 391,418
Unclassified 21,484 162,561
Commingled and Mutual Funds    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 358,423 338,473
Unclassified 280,743 265,709
U.S. Government Securities    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 369,980 316,375
Unclassified 0 0
Other    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 133,508 126,823
Unclassified 133,508 126,823
Real Estate    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 126,886 77,437
Unclassified 126,886 77,437
Partnerships with Security Holdings    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 46,515 49,007
Unclassified 46,515 49,007
Cash, Cash Equivalents and Accrued Items (2)    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 46,013 33,776
Unclassified 46,013 33,776
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 474,831 383,739
Level 1 | Fixed Income    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 31,856 0
Level 1 | Commingled and Mutual Funds    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 77,680 72,764
Level 1 | U.S. Government Securities    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 365,295 310,975
Level 1 | Other    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 1 | Real Estate    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
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 (2)    
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 133,514 234,257
Level 2 | Fixed Income    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 128,829 228,857
Level 2 | Commingled and Mutual Funds    
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 4,685 5,400
Level 2 | Other    
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 | Partnerships with Security Holdings    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 2 | Cash, Cash Equivalents and Accrued Items (2)    
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 46,817 0
Level 3 | Fixed Income    
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 | U.S. Government Securities    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | Other    
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 | Partnerships with Security Holdings    
Fair Value, Separate Account Investment [Line Items]    
Total Assets 0 0
Level 3 | Cash, Cash Equivalents and Accrued Items (2)    
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